un- + advisable
unadvisable (comparative more unadvisable, superlative most 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, John Emory, editor, 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).