στηρικτέον
From LSJ
τὸ γὰρ μυστήριον ἤδη ἐνεργεῖται τῆς ἀνομίας· μόνον ὁ κατέχων ἄρτι ἕως ἐκ μέσου γένηται. (2Thess 2:7) → For the mystery of lawlessness is already at work — just at work until the one who is now constraining it is taken out.
English (LSJ)
one must fix, make firm, Poll.1.213.
Greek (Liddell-Scott)
στηρικτέον: ῥηματ. ἐπίθ., πρέπει τις νὰ στηρίξῃ, στερεώσῃ, Πολυδ. Α΄, 213.