advisability

adjective

1. proper to be suggested or recommended; desirable or wise, as a course of action: Is it advisable for me to write to him?
2. open to or desirous of advice.

adjective

1. worthy of recommendation; prudent; sensible

n.

1778 (in a letter from George Washington at Valley Forge), from advisable + -ity.

adj.

1640s, from advise (v.) + -able.