sizeable vs hefty

sizeable and hefty both are adjectives.

Word	Noun	Adjective	Verb	Adverb
sizeable	No	Yes	No	No
hefty	No	Yes	No	No

As adjectives, sizeable and hefty are synonyms defined as:

Other synonyms of sizeable include goodish, goodly, healthy, respectable, sizable, tidy.

sizeable (adjective)	hefty (adjective)
large in amount or extent or degree	large in amount or extent or degree
fairly large in size	of considerable weight and size
	(of a person) possessing physical strength and weight; rugged and powerful