insolvable

词形变化：

副词: insolvably | 名词: insolvability |

同义词：

unsolvable | unexplainable | abstruse | inexplicable | mysterious | unfathomable | indecipherable | impenetrable | difficult | intricate | enigmatic | indissoluble |

反义词：

soluble |

词义辨析：

同义参见:

abstruse