The Collaborative International Dictionary of English v.0.48:
Sage \Sage\, a. [Compar. Sager; superl. Sagest.] [F., fr. L.
sapius (only in nesapius unwise, foolish), fr. sapere to be
wise; perhaps akin to E. sap. Cf. Savor, Sapient,
1. Having nice discernment and powers of judging; prudent;
All you sage counselors, hence! --Shak.
2. Proceeding from wisdom; well judged; shrewd; well adapted
to the purpose.
Commanders, who, cloaking their fear under show of
sage advice, counseled the general to retreat.
3. Grave; serious; solemn. [R.] "[Great bards] in sage and
solemn tunes have sung." --Milton.
Syn: Wise; sagacious; sapient; grave; prudent; judicious.