As one might guess, a humblebrag is one who uses a pretense of humility as a vehicle for boasting. This word can be found at Urban Dictionary but, it appears, nowhere more authoritative. Yet, of course, the concept is neither new nor esoteric; and one would expect there to be a word to cover it. Of course, we have the idea of false humility and could speak of one who is falsely humble or who is guilty of false modesty.
But isn't there a noun to denote the person who behaves in this way, and an adjective to describe him?
Best Answer
A term you might consider if you want to appear modestly learned is Aristotle's eirôn, a noun variously translated as ‘the mock-modest’ or ‘the self-deprecating’ or ‘the reserved’. Aristotle describes the eirôn as more acceptable than the alazôn, ‘braggart’ or ‘exaggerator’ but not so admirable as the truthful man:
Eirôn gives its name to irony; the word itself doesn't appear to be in the dictionaries, but it had considerable currency in the LitCrit industry for the generation after Northrop Frye made the term central in The Anatomy of Criticism (1957). You'll find it in Abrams and Harpham, A Glossary of Literary Terms. Here's a modern history of the term from a 1991 work, The Critical Mythology of Irony.