incontestible vs watertight

incontestible and watertight both are adjectives.

Word	Noun	Adjective	Verb	Adverb
incontestible	No	Yes	No	No
watertight	No	Yes	No	No

incontestible (adjective)	watertight (adjective)
incapable of being contested or disputed	without flaws or loopholes
	not allowing water to pass in or out