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.
An expressive geminated form of classical 憎き, the attributive form of 憎し “hateful, detestable.”