noun-modifying (irregular)
Colloquial, often used in Kansai dialect to describe a person or situation that is annoyingly loud.
隣の部屋がるっさいなあ。
The next room is so noisy.
noun-modifying (irregular)
Describes a person who is bothersome, nagging, or overly particular. Covers fussy, troublesome, and bossy behavior.
あの先生、宿題のことでるっさいんだよ。
That teacher is so fussy about homework.
るっさいこと言わんといて。
Stop saying annoying things.