WordNet

resistant to destruction or fading; "fast colors"
abstaining from food (同)fasting
securely fixed in place; "the post was still firm after being hit by the car" (同)firm, immobile
firmly or closely; "held fast to the rope"; "her foot was stuck fast"; "held tight" (同)tight
(of a photographic lens or emulsion) causing a shortening of exposure time; "a fast lens"
(of surfaces) conducive to rapid speeds; "a fast road"; "grass courts are faster than clay"
(used of timepieces) indicating a time ahead of or later than the correct time; "my watch is fast"
abstain from certain foods, as for religious or medical reasons; "Catholics sometimes fast during Lent"
abstain from eating; "Before the medical exam, you must fast"
acting or moving or capable of acting or moving quickly; "fast film"; "on the fast track in school"; "set a fast pace"; "a fast car"
at a rapid tempo; "the band played a fast fox trot"
quickly or rapidly (often used as a combining form); "how fast can he get here?"; "ran as fast as he could"; "needs medical help fast"; "fast-running rivers"; "fast-breaking news"; "fast-opening (or fast-closing) shutters"

PrepTutorEJDIC

『速い』,急速な,すばやい,敏速な / (時計が)『進んでいる』 / 『しっかりした』,ぐらつかない / 心の変わらない,忠実な(faithful) / (色が)あせない / 《古》(女性が)身持ちの悪い;《まれに》(生活が)享楽的な / (フイルムが)高感度の,(レンズが)高速撮影用の / 『速く』;すばやく(quickly) / 『しっかりと』,固く(firmly) / 『ぐっすりと』(soundly) / どしどし,ひっきりなしに
断食(だんじき),絶食 / (宗教的行事としての)断食日,断食期間 / 断食する,絶食する / (…で)精進する《+『on』+『名』》