not all that

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not all that

slang Not especially good, remarkable, impressive, attractive, etc., especially compared to what others think. Often stylized as "ain't all that." Sure, he's strong, but he's not all that. I was expecting some superhero levels of strong, so I was kind of disappointed. I just don't see what he likes about her. I mean, she's kinda cute, but she ain't all that.
See also: all, not, that

not all that

phr. not all that much. (Streets.) A: She can run like the wind. B: She can run fast but not all that.
See also: all, not, that