εἰκασμός
From LSJ
μηδέν' ὀλβίζειν, πρὶν ἂν τέρμα τοῦ βίου περάσῃ μηδὲν ἀλγεινὸν παθών → Count no man blessed 'til he's passed the endpoint of his life without grievous suffering. (Sophocles, King Oedipus 1529f.)
English (LSJ)
ὁ,
A conjecturing, guessing, D.H.6.71 (pl.); εἰκασμοῦ ἐπίρρημα conjectural adverb (ἴσως), D.T.642.8; ἐξ εἰκασμοῦ λέγειν Str.17.3.1, cf. Plu.Mar.11, Luc. Herm.16.