'Weightily' definitions:

Definition of 'weightily'

(from WordNet)
adverb
In a serious manner; "the speech was weighty and it was weightily delivered"
adverb
As something very heavy; "she moved weightily"

Definition of 'Weightily'

From: GCIDE
  • Weightily \Weight"i*ly\, adv. In a weighty manner. [1913 Webster]