sustain vs sustainable

sustain is not an adjective while sustainable is an adjective.

Word	Noun	Adjective	Verb	Adverb
sustain	No	No	Yes	No
sustainable	No	Yes	No	No

sustain (adjective)	sustainable (adjective)
	capable of being sustained

sustain (verb)	sustainable (verb)
undergo (as of injuries and illnesses)
establish or strengthen as with new evidence or facts
admit as valid
supply with necessities and support
provide with nourishment
be the physical support of; carry the weight of
lengthen or extend in duration or space