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"solitary" is also used as a crossword clue. If that's what you saw, the answer is often lone (4 letters).
Definitions
devoid of creatures
Word origin
From Middle English solitarie, borrowed from Latin sōlitārius. Doublet of solitaire.
Used in a sentence
“He brooded and intrigued fantastically. He was becoming one of the big-time solitaries. And he wasn't meant to be a solitary. He was meant to be in active life, a social creature.”
“Tilling my own grave to keep me level Jam another dragon down the hole Digging to the rhythm and the echo of a solitary siren One that pushes me along and leaves me so Desperate and ravenous”
“The prisoners who started the riot were moved to solitary.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Unaccompanied”8 letters
02“Alone”8 letters
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