Reverse Dictionary: OPTIMISM

ADJECTIVES
 BULLISH optimistic → 1981 Aust. colloq. (Bk.)
► MICAWBERISH resembling or reminiscent of Micawber; fecklessly optimistic → 1851 
► POLLYANNAISH naively cheerful and optimistic; unrealistically happy → 1922 
► SANGUINE cheerfully optimistic → 1509 
► SUNSHINE-SHOWERY of a disposition that is cheerful in the midst of trouble; cheerfully optimistic → 1830 
► UPBEAT optimistic, positive → 1940s sl., orig. US

NOUNS
► LOVE-IN positive, optimistic relations → 1960s sl., orig. US
► SANGUINE the sanguine temperament; cheerful optimism → 1530 obs.
► SANGUINITY cheerful optimism; hopefulness → 1737 

NOUNS – PERSON
 GOOD-TIME CHARLEY an optimist; a man who is always trying to have a good experience → 2006 sl. (Bk.)
► POLLYANNA a person able to find cause for happiness in the most disastrous situations; a person who is unduly optimistic or achieves happiness through self-delusion → 1921