Colloquial adjective meaning listless, lethargic, or lacking energy; feeling slow or unmotivated.
今日は寝不足で体がかったるい。
I'm feeling sluggish today from lack of sleep.
長時間の会議で頭がかったるくなった。
My head feels heavy/tired after the long meeting.
暑さのせいで動くのがかったるい。
It's so hot that I feel too lethargic to move.
Irritating, tiresome, or annoying — used when something or someone is bothersome or a hassle.
毎回同じ説明をさせられるのは本当にかったるい。
Being forced to give the same explanation every time is really annoying.
あの人の細かい指示が多くて仕事がかったるい。
That person's nitpicking instructions make the work tedious.
買い物疲れでレジの長い列を見るとかったるくなる。
After shopping, seeing a long checkout line makes me feel irritated and worn out.