ἀναντίθετος
From LSJ
λύπης ἰατρός ἐστιν ἀνθρώποις λόγος → for men reason cures grief, for men reason is a healer of grief, a physician for grief is to people a word, pain's healer is a word to man, logos is a healer of man's anguish, talking through one's grief is therapeutic
English (LSJ)
ον,
A not to be contradicted, Olymp.in Phlb.p.247 S.; αἵρεσις Simp. in Epict.p.7 D., al. II without contrary or opposite, Dam.Pr.26, Anon.in Cat.23.21.