American Heritage Dictionary
(1)
Century Dictionary
(2)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
The Bishop's remark was not 'imprudent' - it was plain 100\% false.— CathNews
Cold water was drank eagerly by the imprudent, and generally proved fatal.— An Account of Timbuctoo and Housa Territories in the Interior of Africa
His wife feared that his connexion with the opposition was imprudent, and induced him to return to Ireland.— Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria"
But an untoward delay gave the Southerners time to intrench themselves so strongly that an attack was imprudent, and Meade returned to the north bank of the stream.— Abraham Lincoln, Volume II
After a waltz they both realised that excess would be imprudent, and returned to the lounge I wish you'd tell me something about my son," said Mr. Prohack. "I think you must be the greatest living authority on him Here?"— Mr. Prohack

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word a few times a month.