57 synonyms for considerable such as distinguished, ok, acclaimed, and celebrated. Considerable is an adjective, and its antonyms are paltry and minor.
OK, a fair amount of, a great deal of, a lot of, abundant, ample, appreciable, comfortable, decent, fair, generous, goodly, great, handsome, hefty, large, lavish, lots of, marked, much, not to be sneezed at, noticeable, plenteous, plentiful, plenty of, profuse, reasonable, serious, significant, sizeable, substantial, superabundant, tidy, tolerable, worth having, worth taking into account, and worthwhile.
Acclaimed, celebrated, distinguished, eminent, highly rated, illustrious, important, influential, much touted, noted, noteworthy, of distinction, of high standing, of repute, prominent, renowned, significant, well received, and well thought of.