unaccountable
From LSJ
Δεῖ τοὺς μὲν εἶναι δυστυχεῖς, τοὺς δ' εὐτυχεῖς → Aliis necesse est bene sit, aliis sit male → Die einen trifft das Unglück, andere das Glück
strange: P. and V. θαυμαστός; see strange, unreasonable.
not clear: P. and V. ἀσαφής, ἄδηλος.