luxuriant UK /lʌɡˈzjʊəɹi.ənt/US /ləɡˈʒʊɹi.ənt/ adjective2 •Abundant in growth or detail.Thus, to find luxuriant growths of seaweeds unaffected by man, one must go to the Channel Islands where pollution has not taken its toll. — 1966 •Overdeveloped at the expense of essential organs. formsmore luxuriant · most luxuriant