singular

Beyond or deviating from the usual or expected.

“singular behavior”

Unusual or striking.

“such poise is singular in one so young”

The single one of its kind.

“a singular example”

Being a single and separate person or thing.

“can the singular person be understood apart from his culture?”

“every fact in the world might be singular...unlike any other fact and sole of its kind”

The form of a word that is used to denote a singleton.

Composed of one member, set, or kind.

Grammatical number category referring to a single item or unit.