Ultroneous
[əl-TROH-nee-əs]
Part of speech: adjective
Origin: Latin, 17th century
1.
Spontaneous; voluntary.
Examples of Ultroneous in a sentence
"Our host made an ultroneous offer at the end of the afternoon to make us all supper."
"If I win the lottery, I will take ultroneous vacations whenever the mood strikes me."
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