IPA: /rɪˈspɛktfəl.nəs/
KK: /rɪˈspɛktfəl/
The quality of showing consideration and honor towards others.
Her respectfulness towards her elders is admirable.
Respectfulness → It is formed from "respect" (from Latin "respectus", meaning regard or consideration) and the suffix "-fulness" (meaning the quality of being full of). The word "respectfulness" means the quality of being full of regard or consideration for others.
Think of having a lot of 'regard' ('respect') for others, which is what 'respectfulness' means.