plentiful, ample, abundant, copious mean more than sufficient without being excessive. plentiful implies a great or rich supply <peaches are plentiful this summer>. ample implies a generous sufficiency to satisfy a particular requirement <ample food to last the winter>. abundant suggests an even greater or richer supply than does plentiful<streams abundant with fish>. copious stresses largeness of supply rather than fullness or richness <copious examples of bureaucratic waste>.