肯定
kěndìng
Meaning
肯定 has three uses: 1. Adverb — “certainly”, “definitely”. 2. Adjective — “certain”, “definite”. 3. Adjective — “affirmative”, “positive”.
1. 肯定 as an adverb
Subject + 肯定 + Verb / Adjective
您放心,质量肯定不“打折”。
Don't worry — the quality certainly won't be “discounted”.
每天喝一点儿葡萄酒,对身体是有好处的。
Drinking a little wine each day is good for you.
但是不能喝太多,喝太多酒肯定对身体不好。
But you mustn't drink too much — that is definitely bad for your health.
2. 肯定 as an adjective (certain)
不能肯定的事、没发生过的事,最好不要说。
It's best not to talk about things you're not sure of, or that never happened.
3. 肯定 as an adjective (affirmative)
相信大部分人的回答都是肯定的。
I believe most people's answer would be yes.
肯定 vs. 一定
你一定要来。
You must come.
他肯定会来。
He'll definitely come.
一定 → certainty or obligation.
肯定 → confidence; it can also be an adjective.