lavish (adj.) Look up lavish at Dictionary.com
mid-15c., from Middle French lavasse (n.) "torrent of rain, deluge," from Old French lavache, from laver "to wash," from Latin lavare "to wash" (see lave). Related: Lavishly.
lavish (v.) Look up lavish at Dictionary.com
1540s, from lavish (adj.). Related: Lavished; lavishing.