[81] 81 = 24.222.
ψεῦδός κεν φαῖμεν: sc. “εἶναι”, we might say (potential) that it (i.e. what the Dream promised) was a deceit, cf. v. 349.
καὶ νοσφιζοίμεθα: and might turn away, i.e. be on our guard against the Dream's questionable counsel to try a decisive battle at this time when the mightiest of the Achaeans held aloof from the fight.
μᾶλλον: all the more, as 5.208; since they could put no real confidence in the Dream's message.