self-deprecating

[ self-dep-ri-key-ting, self- ]

/ ˈsɛlfˈdɛp rɪˌkeɪ tɪŋ, ˌsɛlf- /

belittling or undervaluing oneself; excessively modest.

Also self-dep·re·ca·to·ry [self-dep-ri-kuh-tawr-ee, -tohr-ee, self-] /ˈsɛlfˈdɛp rɪ kəˌtɔr i, -ˌtoʊr i, ˌsɛlf-/.

OTHER WORDS FROM self-deprecating

self-dep·re·cat·ing·ly, adverb self-dep·re·ca·tion, noun

But he also kept his sense of humor, some of it self-deprecating.

Despite Crack and Graft, D.C. Loved ‘Hizzoner’ Marion Barry |Lloyd Grove |November 23, 2014 |DAILY BEAST
Vulture, too, noticed her “effortless, self-deprecating charm.”

Jennifer Lawrence Shouldn’t Laugh Off Her Nude Photo Hack |Samantha Allen |September 2, 2014 |DAILY BEAST
Look, Palin fans already love her, and self-deprecating humor makes you appear secure.

Palin TV Will Be Comedy Central |Dean Obeidallah |July 29, 2014 |DAILY BEAST
Unlike past presidents, who typically gave us self-deprecating jokes, Obama uses comedy as a weapon.

The Daily Show President: Obama's Edgy Humor |Dean Obeidallah |July 5, 2014 |DAILY BEAST

She ran the gamut with physical humor and dished out droll, self-deprecating one-liners.

Ann B. Davis Was the Zesty Antidote to the Bradys |Emily Shire |June 2, 2014 |DAILY BEAST
He looked from one to the other, with his melancholy and self-deprecating smile.

The Last Hope |Henry Seton Merriman
He smirked in a self-deprecating way, and pulled his hat-brim down in front.

Dr. Sevier |George W. Cable
Then, there was no limit to the gentle, self-deprecating plausibility with which he alluded to himself.

The White Hand and the Black |Bertram Mitford