疑(うたが)う

疑(うたが)う is a transitive godan verb meaning to doubt, question, or suspect.

Transitivity

他動詞(たどうし) (transitive) - takes を for the object of doubt.

Common expressions

• 目(め)を疑(うたが)う: to doubt one's eyes (can't believe what you see)
• 耳(みみ)を疑(うたが)う: to doubt one's ears (can't believe what you hear)
• 疑(うたが)いなく: without doubt, undoubtedly
• 疑(うたが)いをかける: to cast suspicion on

Related words

• 疑(うたが)い: doubt, suspicion (noun)
• 疑問(ぎもん): question, doubt
• 疑惑(ぎわく): suspicion, distrust
• 半信半疑(はんしんはんぎ): half in doubt

ASPECT (ている):

• 疑(うたが)っている: suspects, doubts (stative — describes a current mental attitude, not an action)
• Note: Like 信(しん)じる and 思(おも)う, 疑(うたが)う in the ている form expresses a sustained mental stance. 警察(けいさつ)は彼(かれ)を疑(うたが)っている = 'the police suspect him.' The plain form usually refers to the moment of forming the doubt or is used in literary writing.