Definition of "stockish"

Since naught so stockish, hard, and full of rage, But music for the time doth change his nature.

c. 1596–1598 (date written), William Shakespeare, “The Merchant of Venice”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act V, scene i]

Many who have "plied their book diligently," and know all about some one branch or another of accepted lore, come out of the study with an ancient and owl-like demeanour, and prove dry, stockish, and dyspeptic in all the better and brighter parts of life.

1881, Robert Louis Stevenson, Virginibus Puerisque