| infuriated(adjective, enthusiastic, ill, sick, fervent) | |
| insane(adjective, enthusiastic, ill, sick, fervent) | |
| intemperate(adjective, enthusiastic, ill, sick, fervent) | |
| intolerant(adjective, enthusiastic, ill, sick, fervent) | |
| irrational(adjective, enthusiastic, ill, sick, fervent) | |
| keen(adjective, enthusiastic, ill, sick, fervent) | |
| last | |
| left-wing extremist | |
| lunatic fringe | |
| mad(adjective, enthusiastic, ill, sick, fervent) | |
| mad-dog(adjective, enthusiastic, ill, sick, fervent) | |
| markedly(adverb, absolutely, very, severely, really) | |
| mega | |
| mighty | |
| mild radical | |
| much | |
| narrow-minded(adjective, enthusiastic, ill, sick, fervent) | |
| nihilist | |
| nutty(adjective, enthusiastic, ill, sick, fervent) | |
| obsessed(adjective, enthusiastic, ill, sick, fervent) |
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| APA | Smart Define. (2015). ultra thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/ultra/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "ultra thesaurus" https://smartdefine.org/ultra/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, ultra thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/ultra/thesaurus/synonyms>. |
| MLA | Smart Define. "ultra thesaurus" 13 April 2015. Web. 25 September 2026. <https://smartdefine.org/ultra/thesaurus/synonyms> |