As adjectives the difference between mumbly and mammery
is that mumbly is prone to mumbling while mammery is prone to mumble or stammer; mumbly or mammery can be .
mammery
English
Etymology 1
Alteration of earlier mamorie, a variant of (mammering), as if from .
Adjective
(
en adjective)
Prone to mumble or stammer; mumbly.
Etymology 2
Misspelling.