unskilled
From LSJ
adj.
Unskilled in: P. and V. ἄπειρος (gen.), ἀμαθής (gen.).
You are unskilled in speaking: Ar. ἀδύνατος εἶ λέγειν (Ar., Nub. 1077).
I am unskilled to plead a cause before the multitude: V. ἐγὼ δʼ ἄκομψος εἰς ὄχλον δοῦναι λόγον (Eur., Hipp. 986).