Source : Webster's Revised Unabridged Dictionary (1913)

Respectful \Re*spect"ful\ (-f?l), a.
   Marked or characterized by respect; as, respectful
   deportment.

         With humble joi and with respectful fear. --Prior.
   -- {Re*spect"ful*ly}, adv. -- {Re*spect"ful*ness}, n.

Source : WordNet®

respectful
     adj 1: full of or exhibiting respect; "respectful behavior"; "a
            respectful glance" [ant: {disrespectful}]
     2: feeling or manifesting veneration [syn: {reverential}, {venerating}]