| big yawn(expression, adjective, dull, flat, ordinary) | |
| big zero(expression, adjective, dull, weak, flat) | |
| bilge | |
| blah-blah | |
| blahs | |
| blank | |
| blase | |
| bleary(adjective, dull, dark, gloomy, faint) | |
| blether | |
| bloodless | |
| blurred(adjective, dull, dark, gloomy, faint) | |
| bop | |
| bored(adjective, dull, cool, indifferent, weary) | |
| breezy(adjective, weak, smooth, pleasant, gentle) | |
| broken-record | |
| bromidic(adjective, dull, simple, stupid, ordinary) | |
| bull | |
| buncombe | |
| bunk | |
| bushwa |
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| APA | Smart Define. (2016). blah thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/blah/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "blah thesaurus" https://smartdefine.org/blah/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, blah thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/blah/thesaurus/synonyms>. |
| MLA | Smart Define. "blah thesaurus" 29 March 2016. Web. 24 September 2026. <https://smartdefine.org/blah/thesaurus/synonyms> |