i-adjective
Expresses strong personal dislike or irritation toward someone or something. Often used when the target's behavior or attitude feels deliberately unpleasant.
See also: 憎たらしい
彼の自慢げな態度が憎らしい。
His boastful attitude is hateful.
あの猫はいつも餌をねだって、憎らしいくらい可愛い。
That cat is always begging for food, and it's so cute it's almost hateful.
i-adjective
Used ironically to express affectionate annoyance, similar to calling someone a 'little devil' or 'you're awful' in a playful way. Often directed at children or loved ones.
この憎らしい子は、また私のケーキを食べちゃった。
This little rascal ate my cake again.