adverb
Adverbial use meaning 'in its entirety' or 'without leaving anything behind'. Often used with verbs like 取る, 食べる, 忘れる.
お金をそっくり取られてしまった。
I had all my money taken.
ケーキをそっくり一人で食べた。
I ate the whole cake by myself.
na-adjective
exactly alike; spitting image; identical
Adjectival use (often with だ/な) meaning 'strikingly similar' or 'looking just like'. Commonly used as そっくりだ or そっくりな.
彼は父親にそっくりだ。
He is the spitting image of his father.
この絵は本物そっくりに描かれている。
This painting is drawn exactly like the real thing.