I-adjective (keiyoushi)
sluggish; languid; listless; heavy (heart, legs, etc.); dull
Usually written using kana alone
だるいし頭がずきずきする。I feel listless and have a throbbing headache. bothersome; tiresome; pain-in-the-ass
Usually written using kana aloneSlang
Also written 懈い【だるい】