This is the 4353rd most frequent Japanese word.
半端
Incomplete; fragmentary; half-hearted; odd.
「半端」 in this sentence is used to describe something being 'incomplete' or 'unfinished.'
この部屋の掃除は半端に終わった。
The cleaning of this room was left unfinished.
「半端」 here emphasizes something to be 'extraordinary' or 'not usual' in context, paired with negation for enhancement.
彼は半端じゃない努力をしている。
He puts in an extraordinary amount of effort.
「半端」 denotes something being 'insignificant' or 'minor,' often used in contexts where negation intensifies its value.