For his long speech how well he spoke! In all its length no rule he broke. In eye, on brow, in all his face The keenest look no guile could trace. No change of hue, no pose of limb Gave sign that aught was false in him.

In plain words: Rama notes that Hanuman spoke a long speech without a single mistake. Nothing in his eyes, face or body showed any lie or trickery.