unheard of

词形变化：

副词: unhealthily | 形容词比较级: unhealthier | 形容词最高级: unhealthiest | 名词: unhealthiness |

同义词：

unwholesome | sickly | weak | unsound | ill | infirm | run-down | ailing | frail | unwell | feeble | indisposed | morbid | diseased | disadvantageous | sick | unfit | out of condition | out of shape | harmful | detrimental | injurious | damaging | invalid | corrupt | unnatural | ghoulish | unhealthful | insalubrious |

反义词：

healthy |