overmodest

adjective

over·​mod·​est ˌō-vər-ˈmä-dəst 

: excessively modest

an overmodest young man

is overmodest about her accomplishments

Alexander Graham Bell was overmodest when he predicted: "One day there would be a telephone in every American city."

—The Guardian

overmodestly adverb

… the outhouse was … overmodestly masked with vines and lattice …

—Sinclair Lewis

overmodesty

ˌō-vər-ˈmä-də-stē 

noun

If "Africa" has a flaw, it is that Mr. Ungar errs on the side of overmodesty.

—Xan Smiley

Word History

First Known Use

1648, in the meaning defined above