| extraordinarily(adverb, absolutely, very, severely, really) | |
| extreme left-winger | |
| far out | |
| farthest | |
| fervent(adjective, enthusiastic, ill, sick, zealous) | |
| flipped(adjective, enthusiastic, ill, sick, fervent) | |
| foaming at the mouth(expression, adjective, idiom, enthusiastic, ill) | |
| frantic(adjective, enthusiastic, ill, sick, fervent) | |
| freaked out(expression, adjective, enthusiastic, ill, sick) | |
| frenetic(adjective, enthusiastic, ill, sick, fervent) | |
| frenzied(adjective, enthusiastic, ill, sick, fervent) | |
| furious(adjective, enthusiastic, ill, sick, fervent) | |
| furthest | |
| gone(adjective, informal, extreme) | |
| highly | |
| hot(adjective, enthusiastic, ill, sick, fervent) | |
| in the extreme(expression, idiom, greatness) | |
| incalculably | |
| indeed | |
| infinitely |
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| APA | Smart Define. (2015). ultra thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/ultra/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "ultra thesaurus" https://smartdefine.org/ultra/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, ultra thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/ultra/thesaurus/synonyms>. |
| MLA | Smart Define. "ultra thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/ultra/thesaurus/synonyms> |