Appaṭivāṇīya (adjective) [gerund of a + paṭi + vr̥; cf. BHS aprativāṇiḥ Divy 655; Mvu III 343] — not to be obstructed, irresistible S I 212 (applied to Nibbāna; Mrs. Rh.D. K.S. I page 274 translation "that source from whence there is no turning back"), Thig 55. {57}