(p. 51) aprayatna lack of effort or endeavour or enthusiasm or assiduity; laxity; neglect. 34)

(p. 687) prayatna repeated or thorough endeavour or effort, perseverance. প্রযত্ন করা v. to persevere. ̃সহকারে adv. perseveringly; thoroughly; carefully. 9)

(p. 761) biphala fruitless, unsuccessful, vain, futile, abortive, unavailing, inefficacious, ineffective; useless. বিফল করা v. to baffle, to foil, to frustrate. বিফল হওয়া v. to abort, to be of no avail; to be foiled; to become unsuccessful, to fail. বিফলতা n. failure, futility, fruitlessness; uselessness. ̃প্রযত্ন a. failed in one's attempt, baffled. বিফলীকরণ n. baffling or foiling. বিফলীকৃত a. baffled, foiled. বিফলীভূত a. baffled, foiled, frustrated. বিফলে adv. in vain; in case of failure. 77)