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Pronunciation varies by accent · noun
(rare) The behaviour of a spoilsport, putting an end to the fun of others..
Use spoilsportism when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Spoilsportism means (rare) The behaviour of a spoilsport, putting an end to the fun of others..
Common synonyms include marplotry.
The opposite depends on the specific sense.
Use spoilsportism where its definition matches the intended context.
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