147 entries under dull topic. ×
| unpersevering(careless, idle, sluggish, inactive) | |
| unproductive(late, incompetent, wasteful, behind) | |
| unpunctual(late, behind, delayed, overdue) | |
| unready(adjective, careless, indifferent, idle) | |
| unresponsive(adjective, quiet, flat, slow) | |
| unused(sluggish, lazy, inactive, motionless) | |
| blank(adjective, quiet, flat, heavy) | |
| callous(adjective, quiet, flat, heavy) | |
| conservative(late, behind) | |
| hindered(late, behind) | |
| impassible(adjective, quiet, flat, heavy) | |
| impeded(late, behind) | |
| insensitive(adjective, quiet, flat, heavy) | |
| long-delayed(late, behind) | |
| long-drawn-out(late, behind) | |
| low(adjective, moderate, unhappy, depressed) | |
| lumpy(adjective, quiet, flat, heavy) | |
| passionless(adjective, quiet, flat, heavy) | |
| placid(adjective, quiet, flat, slow) | |
| prolonged(late, behind) |
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| APA | Smart Define. (2016). slack thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/slack/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "slack thesaurus" https://smartdefine.org/slack/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2016, slack thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/slack/thesaurus/synonyms>. |
| MLA | Smart Define. "slack thesaurus" 26 February 2016. Web. 27 September 2026. <https://smartdefine.org/slack/thesaurus/synonyms> |