lāmaka

adjective insignificant, poor, inferior, bad, sinful. The usual syn. is pāpa
■ Vin.ii.76; Vism.268 (= pāpaka); Dhs-a.45; Kp-a.243 (= khudda); Pp-a 229 (nīca lāmaka = oṇata); Kp-a.150 (˚desanā, cp. ukkaṭṭha); Dhp-a.ii.77; Dhp-a.iv.44 (˚bhāva) Vv-a.116; Pv-a.15 (for pāpa); Pv-a.103 (= pāpaka), Pv-a.125 (˚purisa = kāpurisa); Sdhp.28, Sdhp.253, Sdhp.426, Sdhp.526 (opp ukkaṭṭha)
■ f. lāmikā Ja.i.285; Ja.ii.346 (for itarā) Dhp-a.ii.61 (pāpikā l. diṭṭhi)
■ Cp. Dhs. trsl.2 § 1025.

seems to be a specific Pāli word. It is essentially a C. word & probably of dialectical origin. Has it anything to do with; omaka?