| deciding(definite, precise, sure, decisive, final) | |
| demonstrative(definite, precise, sure, decisive, final) | |
| determinant(adjective, definite, precise, sure, decisive) | |
| determinative(definite, precise, sure, decisive, final) | |
| distinct(plain, exact, precise, explicit, unambiguous) | |
| drawn fine(expression, adjective, exact, special, individual) | |
| emphatically(adverb, strong) | |
| essentially | |
| expeditiously | |
| extremely | |
| extremely fast | |
| fast(adverb, fast) | |
| firm(adjective, complete, total, significant, definite) | |
| fixed | |
| flat-out | |
| flatly(adverb, strong) | |
| full-bore | |
| full blast(adverb, full) | |
| full speed(adverb, maximum) | |
| full speed ahead(expression, idiom) |
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| APA | Smart Define. (2015). flat out thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/flat_out/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "flat out thesaurus" https://smartdefine.org/flat_out/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, flat out thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/flat_out/thesaurus/synonyms>. |
| MLA | Smart Define. "flat out thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/flat_out/thesaurus/synonyms> |