Unproper Definition
adjective
(now rare) Improper, not suited for its use or application; inappropriate. [from 16th c.]
Wiktionary
(rare) Improper, not according with good standards of behaviour; indecent, indecorous. [from 19th c.]
Wiktionary
Origin of Unproper
-
From un- + proper.
From Wiktionary
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