'serene-eyed' originates from the word 'serene,' which comes from Latin 'serenus,' meaning 'clear, unclouded, or calm.'

'serene' evolved from the Latin 'serenus' through Old French 'serain' and Middle English 'serene,' eventually forming the compound 'serene-eyed' in modern English.

Initially, 'serene' meant 'clear or unclouded,' but over time it evolved to mean 'calm and peaceful,' which is reflected in 'serene-eyed.'