1. 重要的;事关重大的
If you describe something such as an issue or a decision as weighty, you mean that it is serious or important.

e.g. Surely such weighty matters merit a higher level of debate?
这样重大的事件谅必应进行更高级别的讨论吧？

2. (尤指书)重的，沉甸甸的
You use weighty to describe something, especially a book, that is heavy or heavier than you would expect.

e.g. Simon lifted a weighty volume from the shelf.
西蒙从书架上取下一本厚重的书。

adj

1. excessively fat

e.g. a weighty man

Synonym: corpulentobeserotund

2. having relatively great weight
heavy

e.g. a weighty load
a weighty package

3. weighing heavily on the spirit
causing anxiety or worry

e.g. weighty problems

4. of great gravity or crucial import
requiring serious thought

e.g. grave responsibilities
faced a grave decision in a time of crisis
a grievous fault
heavy matters of state
the weighty matters to be discussed at the peace conference

Synonym: gravegrievousheavy

5. powerfully persuasive

e.g. a cogent argument
a telling presentation
a weighty argument

Synonym: cogenttelling