adverb
extremely; exceedingly; remarkably
Adverb used to emphasize the degree of a quality, often in formal or written contexts. It conveys that something is outstandingly or conspicuously so.
彼はすぐれて優秀な学生だ。
He is an exceptionally excellent student.
この問題はすぐれて難しい。
This problem is extremely difficult.
非常に is a more common and neutral intensifier meaning 'very', while すぐれて implies an outstanding or conspicuous degree, often with a nuance of excellence.
極めて also means 'extremely', but is more formal and often used in written language. すぐれて can carry a nuance of being remarkably good or conspicuous.
Derived from the verb 優れる (すぐれる, 'to excel'), in its continuative form used adverbially. The adverbial use emphasizes an outstanding degree.