| fiendish | (adjective) extremely evil or cruel; expressive of cruelty or befitting hell | Synonyms: demonic, diabolic, diabolical, hellish, infernal, satanic, unholy |
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| fierce | (adjective) marked by extreme intensity of emotions or convictions; inclined to react violently; fervid | Synonyms: tearing, trigger-happy, vehement, violent |
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| (adjective) ruthless in competition | Synonyms: bowelless, cutthroat |
| (adjective) violently agitated and turbulent | Synonyms: boisterous, rough |
| (adjective) marked by extreme and violent energy | Synonyms: ferocious, furious, savage |
| fiery | (adjective) like or suggestive of fire | Synonyms: igneous |
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| (adjective) passionate or quick-tempered | Synonyms: flaming |
| (adjective) characterized by intense emotion | Synonyms: ardent, fervent, fervid, impassioned, perfervid, torrid |