WITTY - [adjective] clever and amusing in showing thoughts
Examples of use
He's a witty speaker. I can't stop laughing when he's telling his anecdotes.
They always make biting remarks to me, but I never take offence at them, because they are rather witty, not abusive.
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English speaking practise
Remember that if you don't use that word in English conversations or writing you'll forget it in a short time. So the best thing you can do to learn this word is just trying to use it in speaking or writing. Remember also that practise is the key to fluent english speaking.
You can always find a partner, who would also like to improve his/her