All debatable antonyms

adj debatable

• unquestionable — not open to question; beyond doubt or dispute; indisputable; undeniable; certain: an unquestionable fact.
• settled — to appoint, fix, or resolve definitely and conclusively; agree upon (as time, price, or conditions).
• inarguable — not arguable: Her conclusion is so obvious as to be inarguable.
• incontrovertible — not controvertible; not open to question or dispute; indisputable: absolute and incontrovertible truth.
• questionable — of doubtful propriety, honesty, morality, respectability, etc.: questionable activities; in questionable taste.
• undoubted — not called in question; accepted as beyond doubt; undisputed.
• certain — If you are certain about something, you firmly believe it is true and have no doubt about it. If you are not certain about something, you do not have definite knowledge about it.
• definite — If something such as a decision or an arrangement is definite, it is firm and clear, and unlikely to be changed.
• proven — to establish the truth or genuineness of, as by evidence or argument: to prove one's claim.
• sure — free from doubt as to the reliability, character, action, etc., of something: to be sure of one's data.
• clear — Something that is clear is easy to understand, see, or hear.
• decided — Decided means clear and definite.
• resolved — firm in purpose or intent; determined.
• uncontestable — a race, conflict, or other competition between rivals, as for a prize.