怀疑 (huáiyí)

怀疑 means to doubt or suspect something or someone, and can also function as a noun meaning doubt or suspicion.

Meanings

[verb] to doubt; to suspect; to question
[noun] doubt; suspicion

Example Sentences

我怀疑他说的不是真话。 Wǒ huáiyí tā shuō de bù shì zhēnhuà. I suspect what he said is not true.

她对这个计划有很多怀疑。 Tā duì zhège jìhuà yǒu hěn duō huáiyí. She has many doubts about this plan.

别怀疑自己的能力。 Bié huáiyí zìjǐ de nénglì. Don't doubt your own abilities.

警察怀疑他是嫌疑人。 Jǐngchá huáiyí tā shì xiányírén. The police suspect he is a suspect.

Collocations

Collocation	Meaning
产生怀疑	to develop doubts
怀疑态度	attitude of doubt
毫无怀疑	without any doubt
怀疑自己	to doubt oneself

Usage Notes

怀疑 can express either genuine uncertainty (I'm not sure) or active suspicion (I think something is wrong). Context determines which meaning applies. When followed by a clause, it often means "suspect that..." When used as a noun after 有, it means "have doubts." It is more formal than 不相信 (to not believe).

Memory Hook

HUAI (怀 = hold in the heart) + YI (疑 = uncertainty): holding uncertainty in your heart -- that is doubt.