UNIONIZED
nonionized, nonionised, unionized, unionised, nonionic
(adjective) not converted into ions
organized, organised, unionized, unionised
(adjective) being a member of or formed into a labor union; “organized labor”; “unionized workers”; “a unionized shop”
Source: WordNet® 3.1
Etymology 1
Verb
unionized
simple past tense and past participle of unionize
Adjective
unionized (comparative more unionized, superlative most unionized)
Organized into a trades union or trades unions.
Etymology 2
Adjective
unionized (comparative more unionized, superlative most unionized)
(chemistry) Not ionized.
Synonyms
• non-ionic, nonionic, non-ionised, non-ionized, nonionized
Antonyms
• ionised, ionized
Source: Wiktionary