i-adjective
Describes a heavy, lethargic feeling of not wanting to do anything; often used for physical or mental fatigue.
今日はなんだかかったるくて、何もする気が起きない。
I feel kind of listless today and can't bring myself to do anything.
i-adjective
Expresses that something is bothersome or a hassle, making one feel annoyed or reluctant to deal with it.
毎回同じ説明をするのがかったるい。
It's tiresome having to give the same explanation every time.