unadvisable

English

From un- +‎ advisable.

unadvisable (comparative more unadvisable, superlative most unadvisable)

Inadvisable.
- 1941 June, C. Hamilton Ellis, Charles E. Lee, “The Welsh Highland Railway—I”, in Railway Magazine, page 251:
  No steps were taken to enforce it, as, from the financial embarrassment of the company and the uncompleted state of the line, litigation was unadvisable.
- 1948, William Burroughs, letter, 5 Jun 1948:
  Will go back there to get it in a week or so, but may find the harvest unadvisable for reasons of security.
(archaic) Unwilling to take advice.
- 1853, John Wesley, edited by John Emory, The Works of the Rev. John Wesley, Volume 1:
  Together with pride there will naturally arise an unadvisable and unconvincible spirit.
(archaic) Imprudent.

"Inadvisable" is used about 10 times more frequently than "unadvisable" at COCA (US usage) and 20 times more at BNC (UK written usage).