killingly

adv — 2 senses

adv

Etymology From killing + -ly.

So as to kill; fatally.

Figuratively So as to incapacitate with laughter.

I should not be able to say how killingly droll I found this.1916, William Dean Howells, Between the Dark and the Daylight, page 152:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.