| grievous | (adjective) causing fear or anxiety by threatening great harm | Synonyms: dangerous, grave, life-threatening, serious, severe |
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| (adjective) shockingly brutal or cruel | Synonyms: atrocious, flagitious, monstrous |
| (adjective) of great gravity or crucial import; requiring serious thought | Synonyms: grave, heavy, weighty |
| (adjective) causing or marked by grief or anguish | Synonyms: heartbreaking, heartrending |
| mischievous | (adjective) deliberately causing harm or damage | - |
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| (adjective) naughtily or annoyingly playful | Synonyms: arch, impish, implike, pixilated, prankish, puckish, wicked |
| nervous | (adjective) of or relating to the nervous system | Synonyms: neural |
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| (adjective) unpredictably excitable (especially of horses) | Synonyms: flighty, skittish, spooky |
| (adjective) excited in anticipation | Synonyms: aflutter |
| (adjective) easily agitated | - |
| (adjective) causing or fraught with or showing anxiety | Synonyms: anxious, queasy, uneasy, unquiet |