| ardent | (adjective) glowing or shining like fire | - |
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| (adjective) characterized by strong enthusiasm | Synonyms: warm |
| (adjective) characterized by intense emotion | Synonyms: fervent, fervid, fiery, impassioned, perfervid, torrid |
| arduous | (adjective) difficult to accomplish; demanding considerable mental effort and skill | - |
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| (adjective) characterized by effort to the point of exhaustion; especially physical effort | Synonyms: backbreaking, grueling, gruelling, hard, heavy, laborious, operose, punishing, toilsome |
| (adjective) taxing to the utmost; testing powers of endurance | Synonyms: straining, strenuous |