WordNet

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"
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
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"
not clear to the mind; "the law itself was unclear on that point"; "the reason for their actions is unclear to this day"
not explained; "accomplished by some unexplained process"
having the reason or cause not made clear; "an unexplained error"
not yet identified; "an unidentified species"; "an unidentified witness"
a factor in a given situation whose bearing and importance is not apparent; "I dont know what the new man will do; hes still an unknown quantity"

PrepTutorEJDIC

『知られていない』,不明の,無名の / 『未確認の』,未発見の,未知の
『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
《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
説明されない
未確認の,正体不明の
知らない,気づかない

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/08/09 09:21:55」(JST)

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1. 原発不明の腺癌 adenocarcinoma of unknown primary site
2. 原発不明の神経内分泌腫瘍 neuroendocrine cancer of unknown primary site
3. 原発不明癌の分類およびマネージメントの概要 overview of the classification and management of cancers of unknown primary site
4. 原発不明の扁平上皮癌 squamous cell carcinoma of unknown primary site
5. 原発不明の低分化癌 poorly differentiated cancer from an unknown primary site

English Journal

First identification and quantification of S-3-(hexan-1-ol)-γ-glutamyl-cysteine in grape must as a potential thiol precursor, using UPLC-MS/MS analysis and stable isotope dilution assay.

Bonnaffoux H1, Roland A2, Rémond E3, Delpech S2, Schneider R4, Cavelier F5.
Food chemistry.Food Chem.2017 Dec 15;237:877-886. doi: 10.1016/j.foodchem.2017.05.116. Epub 2017 May 30.
PMID 28764081

Impact of trehalose on the activity of sodium and potassium chloride in aqueous solutions: Why trehalose is worth its salt.

Poplinger M1, Shumilin I1, Harries D2.
Food chemistry.Food Chem.2017 Dec 15;237:1209-1215. doi: 10.1016/j.foodchem.2017.06.047. Epub 2017 Jun 10.
PMID 28763971

Pollutants and diet influence carotenoid levels and integument coloration in nestlings of an endangered raptor.

García-Heras MS1, Arroyo B2, Simmons RE3, Camarero PR2, Mateo R2, García JT2, Mougeot F2.
The Science of the total environment.Sci Total Environ.2017 Dec 15;603-604:299-307. doi: 10.1016/j.scitotenv.2017.06.048. Epub 2017 Jun 17.
PMID 28628821

How to reduce cisatracurium consumption in ARDS patients: the TOF-ARDS study.

Hraiech S1,2, Forel JM3, Guervilly C3, Rambaud R3, Lehingue S3, Adda M3, Sylla P3, Valera S3, Carvelli J4, Gainnier M4, Papazian L3, Bourenne J4.
Annals of intensive care.Ann Intensive Care.2017 Dec;7(1):79. doi: 10.1186/s13613-017-0305-2. Epub 2017 Aug 2.
PMID 28770545

Japanese Journal

Impaired overt facial mimicry in response to dynamic facial expressions in high-functioning autism spectrum disorders.

Yoshimura Sayaka,Sato Wataru,Uono Shota,Toichi Motomi
Journal of autism and developmental disorders 45(5), 1318-1328, 2015-05-01
… However, whether such activity is expressed in visible facial mimicry remains unknown. …
NAID 120005602650

高等学校・特別支援学校事務室の風景宮崎県立宮崎西高等学校宮崎県立宮崎西高等学校附属中学校未知の我を求めて Seek your unknown self 立て飛べ行け

学校事務 66(5), 52-55, 2015-05
NAID 40020440073

ADAPTIVE FUZZY SYNCHRONIZATION FOR UNKNOWN CHAOTIC SYSTEMS

LUO LONG
ICIC express letters. Part B, Applications : an international journal of research and surveys 6(5), 1363-1368, 2015-05
NAID 40020355749

Modeling of hole transport across grain boundaries in organic semiconductors for mesoscale simulations

Kobayashi Hajime,Tokita Yuichi
Appl. Phys. Express 8(5), 051602, 2015-04-21
… Mesoscale carrier transport simulations for organic semiconductors with heterogeneous polycrystalline structures are very challenging because the charge transfer rates across the grain boundaries are unknown. …
NAID 150000110556