なかなか
Quite / pretty / unexpectedly (better than expected)
N3
Meaning
Quite / pretty / unexpectedly (better than expected)
Formation
なかなか + Adjective
なかなか + Verb（positive）
Explanation
In positive sentences, 「なかなか」 expresses:
Better than expected
More impressive than assumed
Quite good
Key nuance:
Slight surprise
Mild admiration
Positive evaluation