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soporific(adjective, dull, boring, tedious, dreary)
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stale
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stimulating
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stupid
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tedious
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tired
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tiresome
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trite
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unamusing
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unexciting
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unfunny
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unimaginative
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uninspiring
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wearisome
11 years ago|1.4k views|share |citing 
APASmart Define. (2015). unentertaining thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/unentertaining/thesaurus/synonyms
ChicagoSmart Define. 2015. "unentertaining thesaurus" https://smartdefine.org/unentertaining/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, unentertaining thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/unentertaining/thesaurus/synonyms>.
MLASmart Define. "unentertaining thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/unentertaining/thesaurus/synonyms>