nothing if not

副词 adv.
中文释义
英 /ˈnʌθɪŋ ɪf nɒt/   

英文释义

副词 adv.
  1. Certainly; definitely; (sometimes also obliquely) thoroughly; wholly; to a high degree; extremely. idiomatic,not-comparable
    — Near-synonyms: nothing less than, nothing but
    He is certainly a liar.

词源

Literally, asserts the truth of a statement by saying that the alternative is void.
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