Glass half full

Meaning

Having an optimistic outlook.

Usage

Used when characterizing someone’s positivity.

Origin & History

Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.

Half-filled glass used to contrast optimists and pessimists.

Has been metaphorical since the 1960s.