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〜にしては: for; considering that
N2 · 05 Concession and contrast
Says that something is surprising or does not match what you would expect from a fact.
Noun or plain form + にしては. Example: 初めてにしては上手だ. The speaker compares with a normal expectation. Often shows surprise or praise, but can criticize. Different from 〜わりに(は): that one compares with a standard.
Examples
初めて作ったにしては、上手にできていますね。
For a first attempt, this is nicely made.
子供にしては、難しい言葉をよく知っている。
He knows difficult words, considering he's a child.