pre-noun adjectival
Dated, emphatic pre-noun adjective expressing strong dislike or contempt. Often used in old-fashioned or dramatic speech. Related to 憎い (hateful).
See also: 憎い
あのにっくき男がまた現れた。
That blasted man showed up again.
憎っくき敵を討つ日が来た。
The day has come to strike down the accursed enemy.