(p. 51) apratyaẏa lack of belief or conviction; disbelief; diffidence; incredulity; doubt. অপ্রত্যয়ী a. disbelieving; unconvinced; different; incredulous; doubting. 17)

(p. 56) abiśbāsa distrust, mistrust; incredulity; disbelief; want of conviction or faith; no-confidence; suspicion. অবিশ্বাস করা v. to distrust, to look on with distrust; to disbelieve; to have no faith or confidence in; to treat with suspicion, to suspect. অবিশ্বাসী a. untrustworthy, unfaithful, unreliable; perfidious; distrustful; incredulous; disbelieving; lacking in conviction or faith; suspicious; (esp. in phil.) sceptical. n. a doubter, a disbeliever; (phil.) a sceptic. fem. অবিশ্বাসিনী । অবিশ্বাস্য a. incredible, unbelievable. 123)

(p. 568) nāstika disbelieving in the existence of God, atheistical; disbelieving in the Vedas or scriptures. n. an atheist; an infidel. ̃তা, নাস্তিক্য n. atheism; infidelity. 13)