weighty

adjective

1. 1

   excessively fat

   a weighty man

2. 2

   having relatively great weight; heavy

   a weighty load

   a weighty package

3. 3

   weighing heavily on the spirit; causing anxiety or worry

   weighty problems

4. 4

   of great gravity or crucial import; requiring serious thought

   grave responsibilities

   faced a grave decision in a time of crisis

5. 5

   powerfully persuasive

   a cogent argument

   a telling presentation