ἀσφαλὲς ἀσφαλῆ
From a (as a negative particle) and sphallo (to "fail"); secure (literally or figuratively) -- certain(-ty), safe, sure.
see GREEK a
ἀσφαλὲς (asphales) − 4 Occurrences
ἀσφαλῆ (asphalē) − 1 Occurrence