malicious, ill-tempered, unkind
Example sentences
人前で彼を冷やかすなんて君は意地悪だ。
It is mean of you to ridicule him in public.
嫉妬深い人は、友達にすら、意地悪をして、満足感を得る。
A jealous person gets a feeling of contentment by behaving like a dog in the manger even with his friends.
私はもう彼のあの意地悪な態度に我慢できない。
I can't stand that nasty attitude of his any longer.