Adverb
In a solitary manner; in solitude; alone.
Source: Webster's dictionarya hermit chooses to live solitarily Source: Internet
A dominance hierarchy exists among males, whether they range socially or solitarily. Source: Internet
In addition, walruses feed solitarily but are often near other walruses in small or large groups that may surface and dive in unison. Source: Internet
Pinnipeds may hunt solitarily or cooperatively. Source: Internet
While they sometimes live solitarily, they are more commonly found in groups that average 10–20 individuals, with two to four adult males, four to seven adult females, and the remainder juveniles. Source: Internet