Synonyms of asexual
neuterIn some languages, a neuter noun, pronoun, or adjective has a different form from a masculine or feminine one, or behaves in a different way.
• I am really neuter, neither male nor female.
sexlessIf you describe a person as sexless, you mean that they have no sexual feelings or that they are not sexually active. A sexless relationship does not involve sex.
• The research team has made a mistake by keeping the robots sexless.
Thesaurus for asexual from the Collins English Thesaurus