► 格助詞
とは [とわ] [とは～難い] [と＋は] meaning: doubt rank: 1
☆ これが偶然とは信じ難い (しんじがたい) ⇨ It is hard to believe this is a coincidence (☛ Can be pronounced either にくい or がたい. がたい sounds more literary)
☆ こんなやり方が成功するとは考え難い (がんがえにくい) ⇨ It is hard to think this kind of way would work (☛ Can be pronounced either にくい or がたい. がたい sounds more literary)
► 終助詞
な [な] [coll] [peer] meaning: doubt rank: 1
☆ うーん、なんかどうも変だな ⇨ Hmm, something fishy
☆ なんか嫌な予感がするな ⇨ I just have a bad feeling
ねえ [ねえ] [ね] [coll] meaning: doubt rank: 2
☆ そんな簡単に行くもんですかねえ？ ⇨ Will the thing go that easily?
► 動詞
疑問視 [(2)ぎもんし] [疑問視する] meaning: doubt rank: 3
☆ 計画の成功は疑問視されている ⇨ The success of the project is in doubt
► 名詞
疑問 [ぎもん] [liter] meaning: doubt rank: 1
☆ この薬の効果には疑問が有る ⇨ There is a question about the efficacy of this drug
☆ 私は彼が本当の事を言っていることを疑問に思う ⇨ I doubt that he is telling the truth
迷い [まよい] meaning: doubt rank: 2
☆ 私には何の迷いもない ⇨ I have zero doubt in my mind
不信 [ふしん] meaning: doubt rank: 3
☆ 政治不信が高まっている ⇨ Distrust of politics has been increasing
不信感 [(2)ふしんかん] meaning: doubt rank: 3
☆ 国民の政府に対する不信感 ⇨ The people’s distrust toward the government
懐疑 [(1)かいぎ] [懐疑する] [liter] meaning: doubt rank: 4
☆ 私は懐疑心の塊だった ⇨ I was a lump of suspicion. I was extremely doubtful
► 形容詞
怪しい [(3)あやしい] meaning: doubt rank: 1
☆ 彼の法律の知識は怪しい ⇨ His legal knowledge is iffy, not trustworthy
☆ 彼の話は怪しい ⇨ His story is fishy
疑い無い [(5)うたがいない] meaning: doubt rank: 2
☆ これが事故の原因であることは疑い無い ⇨ There is no doubt that is the cause of the accident
疑い深い [(6)うたがいぶかい] meaning: doubt rank: 3
☆ 彼は疑い深くてどうにも説得出来ない ⇨ He is so distrustful and cannot be persuaded
疑り深い [(6)うたぐりぶかい] meaning: doubt rank: 3
☆ 彼は疑り深くてどうにも説得出来ない ⇨ He is so distrustful and cannot be persuaded