All certain synonyms

adj certain

• undoubtable — to be uncertain about; consider questionable or unlikely; hesitate to believe.
• positive — admitting of no question: positive proof.
• sure — free from doubt as to the reliability, character, action, etc., of something: to be sure of one's data.
• convinced — If you are convinced that something is true, you feel sure that it is true.
• real — true; not merely ostensible, nominal, or apparent: the real reason for an act.
• genuine — possessing the claimed or attributed character, quality, or origin; not counterfeit; authentic; real: genuine sympathy; a genuine antique.
• undeniable — incapable of being denied or disputed: undeniable evidence of arson.
• clear — Something that is clear is easy to understand, see, or hear.
• safe — secure from liability to harm, injury, danger, or risk: a safe place.
• definite — If something such as a decision or an arrangement is definite, it is firm and clear, and unlikely to be changed.
• absolute — Absolute means total and complete.
• true — being in accordance with the actual state or conditions; conforming to reality or fact; not false: a true story.
• precise — definitely or strictly stated, defined, or fixed: precise directions.
• specified — to mention or name specifically or definitely; state in detail: He did not specify the amount needed.
• specific — having a special application, bearing, or reference; specifying, explicit, or definite: to state one's specific purpose.
• individual — a single human being, as distinguished from a group.
• various — of different kinds, as two or more things; differing one from another: Various experiments have not proved his theory.
• particular — of or relating to a single or specific person, thing, group, class, occasion, etc., rather than to others or all; special rather than general: one's particular interests in books.
• numerous — very many; being or existing in great quantity: numerous visits; numerous fish.
• special — of a distinct or particular kind or character: a special kind of key.
• assertive — Someone who is assertive states their needs and opinions clearly, so that people take notice.
• assured — Someone who is assured is very confident and relaxed.
• believing — to have confidence in the truth, the existence, or the reliability of something, although without absolute proof that one is right in doing so: Only if one believes in something can one act purposefully.
• calm — A calm person does not show or feel any worry, anger, or excitement.
• cocksure — Someone who is cocksure is so confident and sure of their abilities that they annoy other people.
• sanguine — cheerfully optimistic, hopeful, or confident: a sanguine disposition; sanguine expectations.
• satisfied — content: a satisfied look.
• secure — free from or not exposed to danger or harm; safe.
• self-confident — realistic confidence in one's own judgment, ability, power, etc.
• unconcerned — not involved or interested; disinterested.
• undisturbed — marked by symptoms of mental illness: a disturbed personality.
• unperturbed — to disturb or disquiet greatly in mind; agitate.
• untroubled — without trouble, discomfort, or disturbance: an easy, untroubled life; He was untroubled by daily setbacks.
• undoubting — to be uncertain about; consider questionable or unlikely; hesitate to believe.
• questionless — unquestionable; doubtless: a questionless fact.
• undoubtful — of uncertain outcome or result.
• authoritative — Someone or something that is authoritative gives an impression of power and importance and is likely to be obeyed.
• conclusive — Conclusive evidence shows that something is certainly true.
• demonstrable — A demonstrable fact or quality can be shown to be true or to exist.
• destined — 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 — If you are determined to do something, you have made a firm decision to do it and will not let anything stop you.
• firm — not soft or yielding when pressed; comparatively solid, hard, stiff, or rigid: firm ground; firm texture.
• fixed — fastened, attached, or placed so as to be firm and not readily movable; firmly implanted; stationary; rigid.
• guaranteed — 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 — a container or receptacle of leather, plastic, cloth, paper, etc., capable of being closed at the mouth; pouch.
• incontrovertible — not controvertible; not open to question or dispute; indisputable: absolute and incontrovertible truth.
• indubitable — that cannot be doubted; patently evident or certain; unquestionable.
• infallible — absolutely trustworthy or sure: an infallible rule.
• irrefutable — not capable of being refuted or disproved: irrefutable logic.
• known — past participle of know1 .