The story
From Latin cōnsuētūdō (oblique stem cōnsuētūdin-) + English -ous, from cōnsuēscō + -tūdō, from con- + suēscō. By surface analysis, consuetude + -ous.
Etymology from Wiktionary, CC BY-SA 4.0.
consuetudinous
Today it means: Of or pertaining to consuetude; of an unwritten law established by usage, derived by immemorial custom from antiquity. Full definition →