Adverb
Verb (する)
Onomatopoeic
1. slowly; unhurriedly; without haste; leisurely; at one's leisure
ゆっくりでもいいですよ。It's okay to go slowly.
2. easily (e.g. in time); well; sufficiently; amply; with time to spare
Adverb
Verb (する)
Onomatopoeic
3. well (e.g. sleep); comfortably
やっと、ゆっくり眠れるようになりそうだな。It looks like I'll finally be able to sleep comfortably.