adverb

1. (usually of relative importance, of degree, quantity or measure) In a double manner; twice the severity or degree.

   “My mother was always doubly careful when winding the grandfather clock.”

2. In two ways

   “Stealing and then lying about it is doubly wrong.”

3. With duplicity

Synonyms: double, twofold, dually, deceptively, double-handedly, duplicitously