sunnier; sunniest
Definition of sunny
1
: marked by brilliant sunlight : full of sunshine
2
: cheerful, optimistic
a sunny disposition
3
: exposed to, brightened by, or warmed by the sun
a sunny room
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The Exceptions Quiz III
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- Which of these words does not mean "nonsense"?

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Merriam-Webster unabridged
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Time Traveler for sunny
The first known use of sunny was in the 14th century
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