ne faire ni chaud ni froid

Literally, “to make neither hot nor cold”. Compare Italian non fare né caldo né freddo.

• IPA^(key): /nə fɛʁ ni ʃo ni fʁwa/

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ne faire ni chaud ni froid

1. (transitive with à) to leave someone indifferent, to not affect someone emotionally one way or another

   Near-synonym: laisser de marbre

   Tes insultes ne me font ni chaud ni froid. ― Your insults didn't move me one way or the other.

• faire chaud au cœur
• faire froid dans le dos