expression, suffix
no chance of; certainly not; will never happen
Attaches to the -masu stem of a verb to express strong denial of possibility. Colloquial and emphatic, often used in casual speech.
こんな難しい問題、できっこないよ。
There's no way I can solve such a difficult problem.
彼が約束を守るなんて、ありっこない。
It's impossible that he'll keep his promise.