WordNet

not established beyond doubt; still undecided or unknown; "an uncertain future"; "a manuscript of uncertain origin"; "plans are still uncertain"; "changes of great if uncertain consequences"; "without further evidence his story must remain uncertain"
lacking or indicating lack of confidence or assurance; "uncertain of his convictions"; "unsure of himself and his future"; "moving with uncertain (or unsure) steps"; "an uncertain smile"; "touched the ornaments with uncertain fingers" (同)unsure, incertain
ambiguous (especially in the negative); "she spoke in no uncertain terms"
not certain to occur; not inevitable; "everything is uncertain about the army"; "the issue is uncertain"
not consistent or dependable; "an uncertain recollection of events"; "a gun with a rather uncertain trigger"
reduce a vowel to a neutral one, such as a schwa
make obscure or unclear; "The distinction was obscured" (同)bedim, overcloud
make undecipherable or imperceptible by obscuring or concealing; "a hidden message"; "a veiled threat" (同)blot_out, obliterate, veil, hide
make less visible or unclear; "The stars are obscured by the clouds"; "the big elm tree obscures our view of the valley" (同)befog, becloud, obnubilate, haze over, fog, cloud, mist
not famous or acclaimed; "an obscure family"; "unsung heroes of the war" (同)unknown, unsung
not drawing attention; "an unnoticeable cigarette burn on the carpet"; "an obscure flaw" (同)unnoticeable
not clearly understood or expressed; "an obscure turn of phrase"; "an impulse to go off and fight certain obscure battles of his own spirit"-Anatole Broyard; "their descriptions of human behavior become vague, dull, and unclear"- P.A.Sorokin; "vague...forms of speech...have so long passed for mysteries of science"- John Locke (同)vague
uncertain as a sign or indication; "the evidence from bacteriologic analysis was equivocal"
open to two or more interpretations; or of uncertain nature or significance; or (often) intended to mislead; "an equivocal statement"; "the polling had a complex and equivocal (or ambiguous) message for potential female candidates"; "the officers equivocal behavior increased the victims uneasiness"; "popularity is an equivocal crown"; "an equivocal response to an embarrassing question" (同)ambiguous
open to question; "aliens of equivocal loyalty"; "his conscience reproached him with the equivocal character of the union into which he had forced his son"-Anna Jameson
of uncertain or ambiguous nature; "the equivocal (or indeterminate) objects painted by surrealists"
not precisely determined or established; not fixed or known in advance; "of indeterminate age"; "a zillion is a large indeterminate number"; "an indeterminate point of law"; "the influence of environment is indeterminate"; "an indeterminate future" (同)undetermined
having a capacity for continuing to grow at the apex; "an indeterminate stem"
not capable of being determined; "the indeterminate number of plant species in the jungle"
not leading to a definite ending or result; "an indeterminate campaign"
not known; "an unknown amount"; "an unknown island"; "an unknown writer"; "an unknown source"
a variable whose values are solutions of an equation (同)unknown_quantity
an unknown and unexplored region; "they came like angels out the unknown" (同)unknown region, terra_incognita
not known to exist; "things obscurely felt surged up from unknown depths"
vague or not clearly defined or stated; "must you be so indefinite?"; "amorphous blots of color having vague and indefinite edges"; "he would not answer so indefinite a proposal"
not decided or not known; "were indefinite about their plans"; "plans are indefinite"
being unsettled or in doubt or dependent on chance; "the uncertainty of the outcome"; "the precariousness of his income" (同)uncertainness, precariousness
showing lack of certainty; "he paused uncertainly"

PrepTutorEJDIC

《補語にのみ用いて》(人が)『確信が持てない』,はっきり分からない / (結果などが)『確かでない』,はっきりしない,疑わしい / 『変わりやすい』,不安定な / 明確でない,ぼんやりした
『はっきりしない』,分かりにくい / よく知られていない,目につかない / 『薄暗』 / …‘を'隠す,おおう / 〈意味など〉あいまいにする,分かりにくくする
二つの意味(いろいろな意味)に取れる(ambiguous) / 疑わしい(doubtful) / 〈人・行動が〉いかがわしい
際限のない;不確定の,漠然とした
『知られていない』,不明の,無名の / 『未確認の』,未発見の,未知の
『不明確な』,不確定の,はっきりしない / (数・量・大きさなどが)不定の,限られていない
〈U〉確信のなさ;疑わしさ;変わりやすさ;不明確さ / 〈C〉《しばしば複数形で》確信のない(疑わしい,変わりやすい,不明確な)こと
確信なく;疑わしく;変わりやすく;ぼんやりと

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/05/08 11:00:22」(JST)

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English Journal

The relationship between bilingualism and selective attention in young adults: Evidence from an ambiguous figures task.

Chung-Fat-Yim A1, Sorge GB2, Bialystok E1.
Quarterly journal of experimental psychology (2006).Q J Exp Psychol (Hove).2017 Mar;70(3):366-372. Epub 2016 Aug 30.
Previous research has shown that bilinguals outperform monolinguals on a variety of tasks that have been described as involving executive functioning, but the precise mechanism for those effects or a clear definition for "executive function" is unknown. This uncertainty has led to a number of studie
PMID 27574851

Mapping the dynamics of cortical neuroplasticity of skilled motor learning using micro X-ray fluorescence and histofluorescence imaging of zinc in the rat.

Alaverdashvili M1, Paterson PG2.
Behavioural brain research.Behav Brain Res.2017 Feb 1;318:52-60. doi: 10.1016/j.bbr.2016.11.002. Epub 2016 Nov 11.
Synchrotron-based X-ray fluorescence imaging (XFI) of zinc (Zn) has been recently implemented to understand the efficiency of various therapeutic interventions targeting post-stroke neuroprotection and neuroplasticity. However, it is uncertain if micro XFI can resolve neuroplasticity-induced changes
PMID 27840249

mHealth Interventions to Counter Noncommunicable Diseases in Developing Countries: Still an Uncertain Promise.

Beratarrechea A1, Moyano D2, Irazola V2, Rubinstein A2.
Cardiology clinics.Cardiol Clin.2017 Feb;35(1):13-30. doi: 10.1016/j.ccl.2016.08.009.
mHealth constitutes a promise for health care delivery in low- and middle-income countries (LMICs) where health care systems are unprepared to combat the threat of noncommunicable diseases (NCDs). This article assesses the impact of mHealth on NCD outcomes in LMICs. A systematic review identified co
PMID 27886783

Management of Acute Hepatotoxicity Including Medical Agents and Liver Support Systems.

Gonzalez HC1, Jafri SM2, Gordon SC3.
Clinics in liver disease.Clin Liver Dis.2017 Feb;21(1):163-180. doi: 10.1016/j.cld.2016.08.012. Epub 2016 Oct 13.
Drug-induced liver injury (DILI) can be predictable or idiosyncratic and has an estimated incidence of approximately 20 cases per 100,000 persons per year. DILI is a common cause of acute liver failure in the United States. No accurate tests for diagnosing DILI exist, and its diagnosis is based on e
PMID 27842770