Which one is synonymous to the word ‘Sanguine’?

Sanguine (adjective):
Meaning: Optimistic or positive, especially in an apparently bad or difficult situation.
Bengali meaning: আশাবাদী।
Synonym: Optimistic, Bullish, Hopeful, Buoyant, Positive.
Antonym: Pessimistic, Gloomy.
Source: Oxford Dictionary & Bangla Academy Dictionary.