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4 thesaurus results for: invalid
Synonym Collection v1.1
Main Entry: invalid
Part of Speech: adjective
Synonyms: baseless, false, inauthentic, inoperative, nugatory, null, null and void, of no efficacy, powerless, unfounded, unlawful, unsound, valetudinarian, void
Synonym Collection v1.1
Copyright © 2008 by Lexico Publishing Group, LLC.
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Synonym Collection v1.1
Main Entry: invalid
Part of Speech: noun
Synonyms: cripple, feeble, ineffective, infirm, null, sickly, unfounded, unreasonable, useless, valetudinarian, void, weak, worthless
Synonym Collection v1.1
Copyright © 2008 by Lexico Publishing Group, LLC.
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Synonym Collection v1.1
Main Entry: invalid
Part of Speech: verb
Synonyms: invalidate, nullify, repeal, stultify, vitiate, weaken
Synonym Collection v1.1
Copyright © 2008 by Lexico Publishing Group, LLC.
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Roget's II: The New Thesaurus
Main Entry: fallacious
Part of Speech: adjective
Definition: Containing fundamental errors in reasoning.
Synonyms: false, illogical, sophistic, specious, spurious, unsound
Roget's II: The New Thesaurus, Third Edition
by the Editors of the American Heritage® Dictionary.
Copyright © 2003, 1995 by Houghton Mifflin Harcourt Publishing Company.
Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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