i Register
In some senses, incessantly is marked as obsolete. Watch for register when choosing this word.
adv
In a manner without pause or stop, especially to the point of annoyance; not ceasing.
He jabbered incessantly and annoyed everyone.
We see the eye subdued, the practised smile, / The word well weighed before it pass the lip, / And know not of the misery within: / Yet there it works incessantly, and fears / The time to come; for time is terrible, / Avenging, and betraying.
Immediately.