νοητέον
From LSJ
ἐξέστω Κλαζομενίοις ἀσχημονεῖν → let the Clazomenians be permitted to behave disgracefully (Aelian, Varia Historia 2.15)
English (LSJ)
one must conceive, θεὸν δὲ ποῖον, εἰπέ μοι, ν.; E.Fr.1129, cf. Gal.6.405.
Greek (Liddell-Scott)
νοητέον: ῥηματ. ἐπίθετ. τοῦ νοέω, δεῖ νοεῖν, ἴδε ἐν λέξει νοέω IV.