certain

(s) definite but not specified or identified
- 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
(a) having or feeling no doubt or uncertainty; confident and assured
- felt certain of success
- was sure (or certain) she had seen it
- was very sure in his beliefs
- sure of her friends
sure,
(a) established beyond doubt or question; definitely known
- 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
(a) certain to occur; destined or inevitable
- 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
sure,
(a) established irrevocably
- his fate is sealed
sealed,
(s) reliable in operation or effect
- a quick and certain remedy
- a sure way to distinguish the two
- wood dust is a sure sign of termites
sure,
(s) exercising or taking care great enough to bring assurance
- be certain to disconnect the iron when you are through
- be sure to lock the doors
sure,

sure sealed

incertain uncertain unsure unsealed

certainly certainty