3
unchangeable(adjective, continuous)
3
unchanged(adjective, same, uniformity, permanence)
3
unexceptional(adjective, everyday, dull, simple, reasonable)
3
unglamourous
3
universal(adjective, regular)
3
unrelieved(adjective, dull, set, boring, constant)
3
weak(adjective, dull, plain, dark, mild)
3
weariful(adjective, dull, simple, excite, boring)
2
automatic(adjective, cold, useful, fixed, powered)
2
bromidic(adjective, dull, simple, stupid, boring)
2
deadly(adjective, dull, dry, boring, tedious)
2
direct
2
discouraging(adjective, dull, gloomy, miserable)
2
disheartening(adjective, dull, gloomy, miserable)
2
dispiriting(adjective, dull, gloomy, miserable, boring)
2
ennui
2
equable(adjective, calm, quiet, soft, reasonable)
2
feeble(adjective, dull, weak, bland, insipid)
2
gray(adjective, dull, dark, gloomy, faint)
2
ho hum(expression, adjective, dull, weak, simple)
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APASmart Define. (2015). monotonous thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/monotonous/thesaurus/synonyms
ChicagoSmart Define. 2015. "monotonous thesaurus" https://smartdefine.org/monotonous/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, monotonous thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/monotonous/thesaurus/synonyms>.
MLASmart Define. "monotonous thesaurus" 13 April 2015. Web. 25 September 2026. <https://smartdefine.org/monotonous/thesaurus/synonyms>