IdiomBody & SensesFrench

Être de mauvais poil

Meaning: To be in a bad mood or irritable disposition.

Literally: To be of bad hair

Example: “Ne lui demande rien avant son café, il est de mauvais poil.” — Don't ask him anything before his coffee; he's in a foul mood.

English equivalent: Like a bear with a sore head

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Origin: Poil is body hair and also an animal's coat, and French has long tied it to temperament: in the 16th century changer de poil meant changing one's attitude or character. Expressio suggests the link is visibility, hair being the first thing one notices about a person, just as a mood is. Être de mauvais poil itself appears only in the first half of the 19th century, along with its opposite, être de bon poil.

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