ἀχρηστέω
From LSJ
τί δὲ βλέπεις τὸ κάρφος τὸ ἐν τῷ ὀφθαλμῷ τοῦ ἀδελφοῦ σου, τὴν δὲ ἐν τῷ σῷ ὀφθαλμῷ δοκὸν οὐ κατανοεῖς → why do you look at the speck of sawdust in your brother's eye and pay no attention to the plank in your own eye | and why beholdest thou the mote that is in thy brother's eye, but considerest not the beam that is in thine own eye | why do you see the speck that is in your brother's eye, but don't consider the beam that is in your own eye
English (LSJ)
A to be useless, S.E.M.1.259.
Greek (Liddell-Scott)
ἀχρηστέω: εἶμαι ἄχρηστις, Σέξτ. Ἐμπ.π. Μ. 1. 259: - ὡσαύτως ἀχρηστεύω Α. Β. 793. 35.
Spanish (DGE)
ser inútil de la gramática, S.E.M.1.54, cf. 259.
Russian (Dvoretsky)
ἀχρηστέω: быть бесполезным, ненужным Sext.