Noun: mumness
Sample Sentences
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Anthony accordingly was mum; but his mumness was visible. He wrapped himself up in secrecy and silence, but both his secrecy and his silence laid him open to the misgivings and the suspicions of those about him. [1891, Tighe Hopkins, The Nugents of Carriconna, page 122:]
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Like Thomas More, I can't advise Mrs. Chodorov. I must remain mum. Herewith my mumness. [1979, New York Magazine, volume 12, number 32, page 37:]
Nouns inflected like mumness
greyware,
chronotropy,
urgrund,
cytosorting,
homekeeping,
pedobaiting,
winterdress,
JLNS,
rumpology,
hopkinsiaxanthin,
enchylemma,
further education,
hexobendine,
humdrumminess,
unobligingness,
backscroll,
telocinobufagin,
dosulepin,
mensuralism,
crème de framboise, etc. (List truncated at 20 nouns)
Etymology
From mum (“silent, secret”) + -ness.