The difference between Informal and Unofficial
When used as adjectives, informal means not formal or ceremonious, whereas unofficial means implicitly true but withheld and/or contradicted by authority.
check bellow for the other definitions of Informal and Unofficial
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Informal as an adjective:
Not formal or ceremonious.
Examples:
"an informal get-together"
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Informal as an adjective:
Not in accord with the usual regulations.
Examples:
"an informal agreement"
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Informal as an adjective:
Suited for everyday use.
Examples:
"'informal clothes"
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Informal as an adjective (of language):
Reflecting everyday, non-ceremonious usage.
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Informal as an adjective (gardening):
Not organized; not structured or planned.
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Unofficial as an adjective:
Not officially established. Implicitly true but withheld and/or contradicted by authority.
Examples:
"the unofficial results of the ballot"
"The unofficial reason for invading the nation, however, was to control their resources."
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Unofficial as an adjective:
Not acting with official authority.
Examples:
"an unofficial adviser"
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Unofficial as an adjective (pharmacology):
Not listed in a national pharmacopeia etc.