A word whose negative counterpart precedes it by over 150 years. Odd. (And while we’re looking at oddities, where does that phrase in the subject line above originate?)
advisably, adv.
In an advisable manner; expediently, prudently, wisely. [Not in TODD 1818, RICHARDSON 1836, CRAIG 1847. But unadvisably is found earlier: 1702 Lond. Gaz. mmmdcccxxii. 2 A Soldier..firing unadvisably upon a Centinel..those who were left behind..were alarmed.]
Neh 