weighty

adj.

[1]	heavy , ponderous , massive , huge , bulky , substantial , ample , large , mammoth , colossal , immense , enormous , gigantic , prodigious , corpulent , fat , obese , adipose , (Colloq) hefty
[2]	important , cogent , telling , consequential , significant , momentous , grave , crucial , portentous , thought-provoking , provocative
[3]	influential , grave , grievous , convincing , persuasive , heavy , impressive , telling , powerful , potent , leading , forceful
[4]	corpulent , obese , rotund