complaisantnessn.
Etymology: formed as complaisant adj. + -ness suffix.
rare. Apparently only attested in dictionaries or glossaries.
1730 N. Bailey et al. Complaisantness, the same as complaisance. [Hence in Johnson and mod. Dicts.]
This entry has not yet been fully updated (first published 1891; most recently modified version published online June 2021).