1. likely to make one stumble or trip : metaphorically slippery, perilous, dangerous , Lat. lubricus, (Herdotus Historicus), etc.:—; σφαλερόν [ ἐστι], with infinitive, it is dangerous to . (Plato Philosophus), etc.

2. σφάλλομαι); ready to fall, tottering, reeling, staggering , (Aeschulus Tragicus); σφ. σύμμαχοι (Demosthenes Orator)

(ML)