| flexible | |
| flexuous(adjective, weak, soft, lifeless, sloppy) | |
| floating(adjective, clear, separate, free, easy) | |
| fluffy | |
| forceless(adjective, uncertain, feeble, shaky, hesitant) | |
| forgetful(soft, tolerant, slack, lenient, remiss) | |
| formative | |
| frail(adjective, weak, uncertain, feeble, faint) | |
| free(adjective, clear, separate, easy, relaxed) | |
| general(soft, tolerant, slack, lenient, remiss) | |
| gone | |
| gone to seed(expression, adjective, idiom, weak, soft) | |
| gutless | |
| imbecile | |
| imprecise(soft, tolerant, slack, lenient, remiss) | |
| impuissant(adjective, uncertain, feeble, shaky, hesitant) | |
| inaccurate(soft, tolerant, slack, lenient, remiss) | |
| inactive(adjective, inert, unreceptive) | |
| inadequate | |
| indefinite(soft, tolerant, slack, lenient, remiss) |
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| APA | Smart Define. (2015). flaccid thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/flaccid/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "flaccid thesaurus" https://smartdefine.org/flaccid/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, flaccid thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/flaccid/thesaurus/synonyms>. |
| MLA | Smart Define. "flaccid thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/flaccid/thesaurus/synonyms> |