misreason noun 1verb 1forms 3 noun1 •Irrational or illogical thinking.A rift through the clouds is seen, Misrule and misreason are forced to fly, Law takes her scepter again — 1879 verb1 •To reason badly; to form an irrational conclusion.I could not, indeed, so strangely misreason as to suppose that sensual indulgence produced superior intelect; but I supposed that in some instances superior intellect might cause sensual indulgence. — 1817 formsmisreasoned · misreasoning · misreasons