Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

EXAMPLES FROM THE WEB FOR UNDOUBTABLE

Now, it is a well-ascertained and undoubtable fact that the passion of love animates the bosoms of red men as well as white.

There was an undoubtable noise of sawing, and I knew at once that a burglar was entering our home.

For then leaving virtue, it falls into disdained baseness, which is the undoubtable badge of one that will betray society.

She read in this singular alteration of his ways the undoubtable indication of an altered character.

He felt that her undoubtable quality had a non-individual flavour, as if standing for her class.

Was it only his habit in diplomatic affairs to doubt everything that was not undoubtable.

WORD ORIGIN

early 15c., from un- (1) "not" + doubt + -able.

MORE RELATED WORDS FOR UNDOUBTABLE

provable

adjectiveinferable
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.