" blue-sky "

[Adjective]  | "blue-sky" | \ ˈblü-ˈskī \

1: marked by a blue cloudless sky : clear

2: characterized by unconstrained optimism or imagination : visionary

3: overly optimistic about the future : unrealistic

Origin: 1852 ;

[Verb]  | "blue-sky" 

1: to offer ideas that are conceived by unrestrained imagination or optimism

Origin: 1957 ;

[Noun]  | "blue sky" 

1: a time or situation marked by easy progress or success

2: overly optimistic and unrealistic thinking about the future

Origin: 1862 ;

[Noun]  | "blue-sky law" 

1: a law providing for the regulation of the sale of securities (such as stock)

Origin: 1911 ;

[Adjective]  | "blue-sky"