killingly

English

Etymology

From killing +‎ -ly.

Adverb

killingly (comparative more killingly, superlative most killingly)

1. So as to kill; fatally.
2. (figuratively) So as to incapacitate with laughter.
   • 1916, William Dean Howells, Between the Dark and the Daylight, page 152:

     I should not be able to say how killingly droll I found this.