a.

1. 懷著希望的；樂觀的[（+about/of）]
   His private expectations were not so sanguine.

   他私下的期望並不是那麼樂觀。

2. 血色好的，紅潤的
3. 血紅的
4. 【罕】嗜血成性的，血腥的

adj.

1. cheerfully optimistic.
2. (in medieval medicine) having a predominance of blood among the bodily humours, supposedly marked by a ruddy complexion and an optimistic disposition.
   ▸archaic (of the complexion) ruddy.
3. archaic bloody or bloodthirsty.
4. literary & Heraldry  blood-red.

n.