1Not puffed or puffed up; not inflated or swollen with pride, vanity, etc. Also (and in earliest use) in "unpuffed up".
2Of a book, play, etc.: given little or no favourable or laudatory publicity; unadvertised, unpromoted. Chiefly in predicative use.
Late 16th century; earliest use found in Arthur Golding (d. 1606), translator. From un- + puffed.