Invariable Definition
 ĭn-vârē-ə-bəl 
    adjective
  
 Not variable; not changing; constant; uniform.
 Webster's New World 
(by extension, grammar, of a word, or a grammatical class) That cannot undergo inflection, conjugation or declension.
The French adjective marron (brown) is invariable: it does not take the usual s in the plural.
 Wiktionary 
Synonyms: 
 Antonyms: 
 Origin of Invariable
-  
in- + variable
From Wiktionary
 
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