i-adjective
totally uninteresting; boring as hell
Colloquial, emphatic negative of 面白い. The prefix 糞 (くそ) adds strong dismissiveness or frustration. Often used in casual speech and online comments.
あの映画、くそおもしろくないって評判だよ。
That movie has a reputation for being boring as hell.
このゲーム、本当に糞面白くない。
This game is really totally uninteresting.
Common word for 'boring' or 'dull'. 糞面白くない is more colloquial and emotionally charged, often implying frustration or contempt.
Formed by prefixing 糞 (くそ, 'damn', 'shit') to the negative form 面白くない (おもしろくない, 'not interesting'). The prefix くそ is a vulgar intensifier common in colloquial Japanese.