nirattha

adjective useless, groundless, unproficient, vain (opp. sāttha profitable) Snp.582 (nt. as adv.), Snp.585 (niratthā paridevanā); Dhp.41; Ja.iii.26; Pv-a.18 (˚bhāva uselessness), Pv-a.83 (= duḥ).

nis + attha