Also means
casual
Usage Note
Informal covers both 'not formal or official' (reunión informal — informal meeting) and 'unreliable, not to be trusted' in Latin American usage (es muy informal — he's very unreliable, doesn't keep his word). This second sense — denoting lack of responsibility or punctuality — can puzzle learners who expect only the English 'casual' meaning.
Examples
"La cena fue una reunión informal entre amigos."
Natural Translation
The dinner was an informal gathering among friends.

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