English word plentiful comes from English plenty, English ful

Detailed word origin of plentiful

Dictionary entry	Language	Definition
plenty	English (eng)	More than enough. (colloquial) Used as an intensifier, very.. More than sufficiently. A more than adequate amount. (nonstandard) many. (nonstandard) much, enough (obsolete) plentiful.
ful	English (eng)
plentiful	English (eng)	(obsolete) lavish; profuse; prodigal. Existing in large number or ample amount.. Yielding abundance; fruitful.

Words with the same origin as plentiful