doubt; suspicion; apprehension
A feeling of doubt or suspicion, often used in the set phrase 疑心暗鬼 (once you suspect something, everything looks suspicious).
He came to harbor suspicion toward his colleague.
I became suspicious and couldn't take his words at face value.
彼女の態度に疑心を抱いた。
I felt suspicion toward her attitude.
My suspicion about her behavior only kept growing.
疑い is the everyday native Japanese word for doubt or suspicion, whereas 疑心 is a Sino-Japanese compound with a more formal, psychological nuance.
信頼 means trust or confidence in someone, the opposite state of mind from 疑心, which is suspicion or doubt.
猜疑心 refers to a deep-seated, persistent distrust of others, while 疑心 is a more general term for a feeling of doubt or suspicion.
Standard kanji spelling; commonly used in compounds like 疑心暗鬼.
Sino-Japanese compound of 疑 (doubt) and 心 (heart/mind). The exact historical derivation is uncertain, but the combination naturally expresses a suspicious state of mind.