solitary
sol-i-ta-ry
adjective
Existing, living, or done alone; single and without companions or others.
"He enjoyed a solitary walk in the woods."
Thesaurus
Synonyms: unaccompanied, lone, lonely, alone, solitary confinement, unsocial, solitudinarian, hermit, troglodyte, recluse, nongregarious, ungregarious