FERVENT stresses sincerity and steadiness of emotional warmth or zeal. fervent good wishes FERVID suggests warmly and spontaneously and often feverishly expressed emotion 영영사전인데 뚜렷한 차이를 못느끼겠는데요
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fervid가 fervent 한 것 보다 좀 더 격하고 irrational?한 느낌이에요