clear β Something that is clear is easy to understand, see, or hear.
definite β If something such as a decision or an arrangement is definite, it is firm and clear, and unlikely to be changed.
genuine β possessing the claimed or attributed character, quality, or origin; not counterfeit; authentic; real: genuine sympathy; a genuine antique.
positive β admitting of no question: positive proof.
real β true; not merely ostensible, nominal, or apparent: the real reason for an act.
safe β secure from liability to harm, injury, danger, or risk: a safe place.
sure β free from doubt as to the reliability, character, action, etc., of something: to be sure of one's data.
true β being in accordance with the actual state or conditions; conforming to reality or fact; not false: a true story.
undeniable β incapable of being denied or disputed: undeniable evidence of arson.
ascertained β to find out definitely; learn with certainty or assurance; determine: to ascertain the facts.
authoritative β Someone or something that is authoritative gives an impression of power and importance and is likely to be obeyed.
conclusive β Conclusive evidence shows that something is certainly true.
demonstrable β A demonstrable fact or quality can be shown to be true or to exist.
destined β If something is destined to happen or if someone is destined to behave in a particular way, that thing seems certain to happen or be done.
determined β If you are determined to do something, you have made a firm decision to do it and will not let anything stop you.
re-establish β to found, institute, build, or bring into being on a firm or stable basis: to establish a university; to establish a medical practice.
firm β not soft or yielding when pressed; comparatively solid, hard, stiff, or rigid: firm ground; firm texture.
fixed β fastened, attached, or placed so as to be firm and not readily movable; firmly implanted; stationary; rigid.
guaranteed β a promise or assurance, especially one in writing, that something is of specified quality, content, benefit, etc., or that it will perform satisfactorily for a given length of time: a money-back guarantee.
in the bag β a container or receptacle of leather, plastic, cloth, paper, etc., capable of being closed at the mouth; pouch.
incontrovertible β not controvertible; not open to question or dispute; indisputable: absolute and incontrovertible truth.
indubitable β that cannot be doubted; patently evident or certain; unquestionable.
infallible β absolutely trustworthy or sure: an infallible rule.
irrefutable β not capable of being refuted or disproved: irrefutable logic.
sure thing β something that is or is supposed to be a certain success, as a bet or a business venture: He thinks that real estate is a sure thing.
trustworthy β deserving of trust or confidence; dependable; reliable: The treasurer was not entirely trustworthy.
unambiguous β not ambiguous, or unclear; distinct; unequivocal: The object of the experiment was to reach an unambiguous conclusion about climate change.
undoubted β not called in question; accepted as beyond doubt; undisputed.
unequivocal β not equivocal; unambiguous; clear; having only one possible meaning or interpretation: an unequivocal indication of assent; unequivocal proof.
unerring β not erring; not going astray or missing the mark: The captain set an unerring course for home.
verifiable β to prove the truth of, as by evidence or testimony; confirm; substantiate: Events verified his prediction.
inferable β to derive by reasoning; conclude or judge from premises or evidence: They inferred his displeasure from his cool tone of voice.
certain β 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.
deductible β If a payment or expense is deductible, it can be deducted from another sum such as your income, for example, when calculating how much income tax you have to pay.
testable β the means by which the presence, quality, or genuineness of anything is determined; a means of trial.
confirmed β You use confirmed to describe someone who has a particular habit or belief that they are very unlikely to change.
documented β a written or printed paper furnishing information or evidence, as a passport, deed, bill of sale, or bill of lading; a legal or official paper.