1. unhyphenated - Adjective
2. unhyphenated - Verb
unhyphenated
simple past and past participle of unhyphenate
Lacking a hyphen.
The word cooperation is unhyphenated, though some also spell it as co-operation.
(Canada, US) Of people, belonging to a single ethnicity or nationality: names for multi-ethnic/multi-nationality groups generally require a hyphen to connect the names being combined.
Source: en.wiktionary.org