invariable
UK /ɪnˈvɛɹ.i.ə.bl̩/ US /ɪnˈvɛɹ.i.ə.bl̩/
adj 3noun 1
Definitions
adj
1
Not variable; unalterable; uniform; always having the same value.
Physical laws which are invariable.
“A tight little craft,” was Austin’s invariable comment on the matron; and she looked it, always trim and trig and smooth of surface like a converted yacht cleared for action.
2
Constant.
3
That cannot undergo inflection, conjugation or declension.
The French adjective marron ‘brown’ is invariable: it does not take the usual s in the plural.
noun
1
Something that does not vary; a constant.
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