i-adjective
Describes a person's manner or reply that is dismissively brief, unfriendly, or lacking warmth. Often used when someone is being deliberately unkind or indifferent. Compare with 素っ気ない (そっけない), which is more common and has a very similar meaning.
See also: 素っ気ない
He gave a curt reply.
そんなすげない態度を取らないでください。
Please don't take such a cold attitude.