60 synonyms for ample such as broad, a gogo, baggy, and big. Ample is an adjective, and its antonyms are insufficient and meagre.
A gogo, abundant, adequate, allowable, bounteous, bountiful, bumper, copious, decent, enough, enough and to spare, flush, galore, generous, great, huge, inexhaustible, infinite, lank, large, lavish, liberal, more than enough, opulent, overflowing, passable, plenteous, plentiful, plenty, plenty of, profuse, prolific, rich, satisfactory, sufficient, suitable, superabundant, teeming, and tolerable.
Baggy, big, broad, capacious, commodious, extensive, full, generous, large, loose-fitting, roomy, sizeable, slack, sloppy, slouchy, spacey, spacious, substantial, voluminous, and wide.