Unmixed is a related term of undesigning.
As adjectives the difference between unmixed and undesigning
is that unmixed is pure, not mixed or combined while undesigning is having no artful, ulterior, or fraudulent purpose; sincere; artless; simple.
undesigning
English
Adjective
(
en adjective)
Having no artful, ulterior, or fraudulent purpose; sincere; artless; simple.