sage 1 
(sāj)
(sāj)n.
One venerated for experience, judgment, and wisdom.
adj. sag·er, sag·est
1. Having or exhibiting wisdom and calm judgment.
2. Proceeding from or marked by wisdom and calm judgment: sage advice.
3. Archaic Serious; solemn.
[Middle English, from Old French, from Vulgar Latin *sapius, from Latin sapere, to be wise; see sep- in the Appendix of Indo-European roots.]
sagely adv.
sageness n.