Baretti: A dictionary of the English and Italian languages
Profondá-re, v. n.
1. to sink, go down to the bottom, to perish; 2. (fig.) to fall into poverty;3. to go deep, dive into, search into, sift, examine;v. a. to sink, immerse; v. r. 1. to drown, drown one's self; 2. (fig.) to insinuate one's self into any thing; adj. Profondá-nte.
Florio: a worlde of wordes, or most copious, dictionarie in Italian and English
profondare: to sinke downe. Also to dig deepe. Also to thrust to the bottome.