In a relaxed, informal, or offhand manner without showing much concern or effort. Done without planning or ceremony.
From Latin 'casualis' meaning by chance or accident, from 'casus' meaning fall or chance event. The modern sense of informal or relaxed developed in English during the 20th century, particularly in describing clothing and social interactions.
The word's journey from meaning 'by accident' to 'informally dressed' reflects major social changes! What we now call 'business casual' would have been an oxymoron to earlier generations who maintained strict dress codes for different occasions.
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