adjective/a.ka.ʁjatʁ/
cantankerous, ill-tempered, shrewish
Related: acariâtrement, acariâtreté
From Saint Acaire, bishop of Noyon, or from a- + Ancient Greek χάρις (kháris, “grace”) + -âtre (pejorative suffix). "possibly named from Saint Acaire, bishop of Noyon, known for healing fools".