• Bengali Word নিশ্চিন্ত English definition (adjective) 1 not worried/ anxious; untroubled; unperturbed. 2 carefree; unconcerned; thoughtless; insouciant; easy; unruffled. নিশ্চিন্ত করা (verb transitive) put/ set somebody's mind at ease/ rest; relieve anxiety; still the fears; remove somebody's fears/ doubts/ worries; relieve the mind of; reassure somebody (about something). নিশ্চিন্ত হওয়া (verb transitive) be/ feel relieved; be reassured; be/ feel at one's ease; be/ feel completely relaxed. নিশ্চিন্ততা (noun) freedom from care; unconcern; carefreeness; nonchalance; peace of mind; tranquillity.