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

So going into this game against Uruguay, there was none of the usual English self-deprecation.

Uruguay’s Luis Suárez Puts Two Stakes Through England’s Heart |Tunku Varadarajan |June 19, 2014 |DAILY BEAST
Then, in that interview, the Oscar nominee took the self-deprecation shtick beyond any reasonable expectation.

Is Jennifer Lawrence Going Stir Crazy From ‘Hunger Games’ Hype? |Chris Lee |March 23, 2012 |DAILY BEAST
A master of self-deprecation, Sloane Crosley is faced with a baffling number of choices.

All the Happy/Sad Young Literary Women |Sarah Norris |June 15, 2010 |DAILY BEAST
Chauvelin put up his hand with a gesture of self-deprecation.

El Dorado |Baroness Orczy

The modesty and self-deprecation in the Michigan correspondence will attract notice.

The Writings of Henry David Thoreau, Volume VI, Familiar Letters |Henry David Thoreau
Soligen chuckled abruptly, and as though in self-deprecation.

Frigid Fracas |Dallas McCord Reynolds
"Oh no," said Sir Henry, with a gesture of self-deprecation.

Peeps at People |John Kendrick Bangs