noun which may take the genitive case particle 'no'
Used to describe something that leaves no room for complaint; often as 文句なしの or 文句なしに. The cross-reference 文句なく is the adverbial form.
See also: 文句なく
彼の演技は文句なしの出来だった。
His performance was flawless.
このレストランの味は文句なしだ。
The taste of this restaurant is undisputed.