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English definition of “not all that”

not all that

informal
not very: I'm not all that keen on swimming.Very and extremeComplete and wholeIntensifying expressions Grammar:No or not?No and not are the two most common words we use to indicate negation. We use no before a noun phrase:See moreGrammar:NotNot is one of the most common words we use to indicate negation. It is often shortened to n’t and joined to an auxiliary verb or modal verb:See moreGrammar:Not in negative statements (She hasn’t …, I did not …)We form negative declarative clauses with not after be (she is not talking), after modal verbs (they must not go) and after auxiliary verbs do and have (we did not like it; they have not eaten).See moreGrammar:Not and n’t in questions (Did younot …? Wasn’t she …?)We use not or n’t to form negative questions:See moreGrammar:Don’t, Do not: orders and instructionsWe use don’t + the base form of the verb or do + not + the base form of the verb to make negative imperatives. We use these to give orders, instructions or commands. Do not is stronger and much more formal:See moreGrammar:Not: short repliesWe use not in negative short replies with mental process verbs (e.g. be afraid, guess, hope):See moreGrammar:Not: contrastWe often use not after but to express a contrast. We often leave out the verb phrase or part of it in the second clause:See moreGrammar:Not + -ing and not + toWe use not before an -ing clause in more formal styles:See moreGrammar:Or notWe can use or not in questions to ask about a range of possibilities:See moreGrammar:So and not with expect, hope, think, etc.We can use so after some verbs instead of repeating an object clause, especially in short answers. The verbs we do this with most are: appear, assume, be afraid (meaning ‘regret’), believe, expect, guess, hope, imagine, presume, reckon, seem, suppose, think:See more
(Definition of not all that from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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