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Thesaurus: certain


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certain

adjective
  1. In a definite and final form; not likely to change: firm 1, fixed, flat, set 1. See change
  2. Bound to happen: inescapable, inevitable, sure, unavoidable. See certain
  3. Established beyond a doubt: hard, inarguable, incontestable, incontrovertible, indisputable, indubitable, irrefutable, positive, sure, unassailable, undeniable, undisputable, unquestionable. See certain, true
  4. Known positively: definite, positive, sure. Idiom: for certain. See certain
  5. Such as could not possibly fail or disappoint: infallible, secure, sure, unerring, unfailing. Informal: sure-fire. See certain
  6. Having no doubt: assured, confident, positive, sure, undoubting. See certain

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Roget's II: The New Thesaurus, Third Edition by the Editors of The American Heritage® Dictionary.
Copyright © 1995 by Houghton Mifflin Company.
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