vitatha

adjective untrue; nt. untruth DN.ii.73 (na hi Tathāgatā vitathaṃ bhaṇanti); Snp.9 sq.; Vv.53#15 (= atatha, musā ti attho Vv-a.240); Ja.v.112; Ja.vi.207; Pts.104; DN-a.i.62
avitatha true SN.ii.26; SN.v.430; Mil.184; Sdhp.530; DN-a.i.65.

vi + tatha; cp. Epic & Class. Sk. vitatha