What does "incessancy" mean?

The quality of being incessant; unceasingness.

Incessancy

Common synonyms include: ceaselessness, ceaselessness, chattering, coeternity, consecutiveness, constancy.

noun

noun ·Uncommon ·College level

Noun

1
The quality of being incessant; unceasingness. uncountable, usually
"Or chatter, with incessancy of tongue / Careless, if kind, or cruel, right, or wrong"
2
the quality of something that continues without end or interruption wordnet

"Or chatter, with incessancy of tongue / Careless, if kind, or cruel, right, or wrong"

From incessant.