There are various synonyms for the word "nameless" that can be used to describe someone or something that lacks a name or is unknown. Some of the synonyms include anonymous, unidentified, faceless, unacknowledged, and unfamiliar. Anonymous refers to someone or something that is not identified by name, while unidentified is used to describe an unknown or unrecognizable person or object. Faceless is a term used to describe someone or something that has no distinctive features, and unacknowledged refers to something that goes unnoticed or unrecognized. Finally, unfamiliar describes something or someone that is not known or familiar to a particular individual or group. These synonyms can be used interchangeably to convey the idea of something or someone nameless or unknown.