This is the 20th most frequent Bulgarian word.
още
"Още" means "still," "more," or "yet" in English, depending on context.
In this sentence, 'още' is used to ask if the state of not being ready persists, meaning 'yet' in English.
Още ли не си готов?
Are you not ready yet?
The word 'още' is used in the sense of 'more' to indicate an additional amount of something, in this case, time.
Тя има още време, преди да тръгне.
She has more time before she leaves.
Here, 'още' is used as 'another' to imply the addition of one additional instance, specifically a question.