• Bengali Word নিষ্ঠ English definition (adjective) (used also as a suffix) 1 intent on; devoted to: কর্মনিষ্ঠ, ধর্মনিষ্ঠ, কর্তব্যনিষ্ঠ. 2 being in/ on; situated on; grounded/ resting on; fixed; firm. নিষ্ঠা (noun) 1 attachment; devotion; application. 2 devoutness; strict observance of religious rites. 3 firmness; steadiness. 4 position; state; condition. নিষ্ঠবান (adjective) 1 devoted; attentive to; dedicated; devout; orthodox; traditional নিষ্ঠবতী (feminine) = নিষ্ঠ. নিষ্ঠভরে (adverb) devoutly; devotedly; loyally; religiously.