all that

as in not all that good, is common as a colloquial intensifier

(I looked around the stock. It wasn't all that brilliant, I must admit—J. Leasor, 1969

I'm just not all that happy right now—weblog, American English 2004 [Old English (up to 1150)C].

Gowers (1965) judged that the use was 'well on its way to literary status', and it is indeed now a standard construction, though still with a whiff of the conversational about it.

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