say sth. with certainty; be positive about a thing, event, etc.; speak by the card; speak on good grounds; speak practically; speak with precision, as from exact information; said with definite evidence
得意忘言: have a tacit understanding; the meaning being already known, one's words are therefore no more necessary
美不胜言: (the landscape) is too beautiful for words; be beautiful beyond all description
Example Sentences:
1.
Moral principles are expressed in absolutes 道德原则言之凿凿。
2.
Claims that this club has been unable to function since 2005 seem overblown 自2005年以来，欧盟不能正常运转的说法言之凿凿，现在看来是过分夸大。
3.
Invalid party , valid party and middle party all have their own reasons , so unity of views is still far away 无效论、有效论和中间论等观点均言之凿凿,故而至今未见意见有统一趋向。
4.
Indeed , a propos of the television series , the same senior chinese diplomat mentioned earlier argued energetically that pacifist japan ' s post - war rise was a model of good - neighbourliness that china itself could usefully emulate 实际上，这部纪录片的支持者，也就是上述那位外交官言之凿凿的指出：日本战后坚持走和平之路成为了一个好邻居，他的崛起是中国值得学习的。
5.
Crouching tiger , hidden dragon became one of the biggest hits of 2000 and the most popular foreign films in us history , and went on to earn a roaring 130 million at the box office and garner 4 academy awards , among the long list of awards it won 这实在是一件匪夷所思的事情。就连章子怡自己也困惑了，张艺谋与章子怡两人就此事进行了一番长谈。虽然张艺谋言之凿凿地说，没觉得她长得像巩俐。
