Synonyms for Make certain:

• v.

  •ascertain (verb)
  • fix,
  • discover,
  • find out,
  • identify,
  • pick up on,
  • settle,
  • double-check,
  • get the hang of,
  • eyeball,
  • peg,
  • read,
  • size,
  • verify,
  • determine,
  • eye,
  • make sure,
  • catch on,
  • check up on,
  • look-see,
  • check,
  • get it down,
  • get hold of,
  • see,
  • pick up,
  • dig,
  • get down pat,
  • divine,
  • establish,
  • check out,
  • tell,
  • learn,
  • learn the ropes,
  • get down cold,
  • size up.
  •attend, tend (verb)
  • mind.
  •ensure (verb)
  • effect,
  • lock on,
  • provide,
  • put on ice.
  •guarantee (verb)
  • testify,
  • mortgage,
  • evidence,
  • give bond,
  • bankroll,
  • support,
  • witness,
  • ensure,
  • wager,
  • stake,
  • bind oneself,
  • vouch for,
  • aver,
  • swear,
  • make bail,
  • guaranty,
  • attest,
  • get behind,
  • endorse,
  • juice,
  • pick up the check,
  • be surety for,
  • cosign,
  • answer for,
  • angel,
  • pick up the tab,
  • maintain,
  • evince,
  • affirm,
  • stand up for,
  • stand behind,
  • prove,
  • grubstake,
  • sign for,
  • reassure,
  • back.
  •mind (verb)
  • care for,
  • have charge of,
  • listen up,
  • be attentive.
  •settle (verb)
  • put into order,
  • form judgment,
  • make a decision,
  • discharge,
  • come to a conclusion,
  • clean up,
  • come to an agreement.
  •verify (verb)
  • stand up,
  • check up.

• Other synonyms:

  •
  • jell,
  • ossify,
  • solidify,
  • firm up,
  • consolidate.
  •
  • crystallize,
  • gel.
  •
  • reinforce.
  •
  • cement,
  • strengthen.
  •
  • certain,
  • confirm.
  •
  • firm.
  •ascertain
  • double checked,
  • sizing,
  • double check,
  • got down,
  • sized,
  • double-checks,
  • eyeballing,
  • look see,
  • eyeballs,
  • made sure,
  • caught on,
  • double-checked,
  • got hold of,
  • sizing up,
  • eyeballed,
  • check on,
  • makes certain,
  • picking up on,
  • getting hold of,
  • picked up,
  • made certain,
  • double checking,
  • Pegged.
  •guarantee
  • Mortgaging,
  • mortgaged,
  • co-sign,
  • stood up for,
  • Guarantying,
  • Guarantied,
  • gets behind,
  • juiced,
  • juicing.
  •make sure
  • ascertain.
  •Other relevant words:
  • select,
  • undertake,
  • pick,
  • swear to,
  • guarantee,
  • be vigilant,
  • promise,
  • attest to,
  • stabilize,
  • convince,
  • pledge,
  • sort out,
  • settle on,
  • set,
  • see to it,
  • settle upon,
  • be confident of,
  • be sure,
  • persuade,
  • make sure of,
  • remove all doubt,
  • get at,
  • appoint,
  • set at rest,
  • warranty,
  • be certain,
  • agree,
  • ensures.

Antonyms for Make certain:

• v.

  • ascertain
    help, unsettle, assist, aid, confuse, invalidate, neglect, overlook, miss, misunderstand, destroy, disprove, look away, ignore.
  • ensure
    endanger, injure, forget, deny, repudiate, reject, hurt, veto, harm, contradict.
  • guarantee
    let go, oppose, refute, discourage, break.
  • mind
    disregard, obey, disobey.
  • settle
    disorganize, derange, hesitate, owe, disagree, refuse, depart, leave, trouble, begin, move, lose, mix up, mismanage, disarrange, upset, disorder, commence, start, worry, disturb.
  • verify
    discredit, hide, conceal.