Main entry: certain
Definition: established beyond doubt or question; definitely known
Usage: what is certain is that every effect must have a cause; it is certain that they were on the bus; his fate is certain; the date for the invasion is certain
Antonyms: uncertain
Definition: not established beyond doubt; still undecided or unknown
Antonyms: uncertain, unsure, incertain
Definition: lacking or indicating lack of confidence or assurance
Antonyms: indefinite
Definition: vague or not clearly defined or stated
Main entry: sure, certain
Definition: having or feeling no doubt or uncertainty; confident and assured
Usage: felt certain of success; was sure (or certain) she had seen it; was very sure in his beliefs; sure of her friends
Antonyms: uncertain, unsure, incertain
Definition: lacking or indicating lack of confidence or assurance
Antonyms: negative
Definition: characterized by or displaying negation or denial or opposition or resistance; having no positive features
Antonyms: neutral
Definition: possessing no distinctive quality or characteristics
Antonyms: negative
Definition: reckoned in a direction opposite to that regarded as positive
Antonyms: disconfirming, negative
Definition: not indicating the presence of microorganisms or disease or a specific condition
Antonyms: shy, timid, unsure, diffident
Definition: lacking self-confidence
Antonyms: unconvinced
Definition: lacking conviction
Main entry: certain, sure
Definition: certain to occur; destined or inevitable
Usage: he was certain to fail; his fate is certain; In this life nothing is certain but death and taxes- Benjamin Franklin; he faced certain death; sudden but sure regret; he is sure to win
Antonyms: uncertain
Definition: not certain to occur; not inevitable
Antonyms: unbound
Definition: not restrained or tied down by bonds
Antonyms: unbound
Definition: not secured within a cover
Antonyms: free
Definition: unconstrained or not chemically bound in a molecule or not fixed and capable of relatively unrestricted motion
Main entry: certain, sealed
Definition: established irrevocably
Usage: his fate is sealed
Main entry: certain, sure
Definition: exercising or taking care great enough to bring assurance
Usage: be certain to disconnect the iron when you are through; be sure to lock the doors
Antonyms: careless
Definition: marked by lack of attention or consideration or forethought or thoroughness; not careful
Main entry: certain
Definition: definite but not specified or identified
Usage: set aside a certain sum each week; to a certain degree; certain breeds do not make good pets; certain members have not paid their dues; a certain popular teacher; a certain Mrs. Jones
Antonyms: indefinite
Definition: vague or not clearly defined or stated
Main entry: sure, certain
Definition: reliable in operation or effect
Usage: a quick and certain remedy; a sure way to distinguish the two; wood dust is a sure sign of termites
Antonyms: undependable, unreliable
Definition: not worthy of reliance or trust