• Bengali Word নিশ্চয় English definition (noun) 1 conviction; certainty; positiveness. 2 firm/ sure knowledge. 3 inquiry; ascertainment. 4 decision; resolution; resolve. (adjective) 1 certain; convinced; sure; ensured: আগে নিশ্চয় হও, তারপর কিছু করো. 2 firm; sure; positive: নিশ্চয় বাক্য. (adverb) without doubt; for certain; certainly; surely; positively; definitely; of course: আসবে বৈকি, নিশ্চয় আসবে. নিশ্চয় করা (verb transitive) make sure/ certain (that); ensure; ascertain; determine; resolve; settle. নিশ্চয় করে (adverb) firmly; with conviction; for certain. নিশ্চয়তা (noun) certainty; sureness; surety; assurance; guarantee.