Origin: 1425–75; late Middle English lavas profusion (noun), profuse (adj.) < Middle French lavasse downpour of rain, derivative of laver to wash < Latin lavāre
Synonyms 1, 2. unstinted, extravagant, wasteful, improvident; generous, openhanded. Lavish,prodigal,profuse refer to that which exists in abundance and is poured out copiously. Lavish suggests (sometimes excessive) generosity and openhandedness: lavish hospitality; much too lavish. Prodigal suggests wastefulness, improvidence, and reckless impatience of restraint: a prodigal extravagance. Profuse emphasizes abundance, but may suggest overemotionalism, exaggeration, or the like: profuse thanks, compliments, apologies. 3. heap, pour; waste, squander, dissipate.
mid-15c., from M.Fr. lavasse (n.), from O.Fr. lavache "torrent (of rain), deluge," from laver "to wash," from L. lavare "to wash" (see lave). The verb is first recorded 1540s.