'Solidly' definitions:

Definition of 'solidly'

From: WordNet
adverb
As an undiversified whole; "the unions voted solidly for Roosevelt"
adverb
With strength and soundness; "a solidly built house"

Definition of 'Solidly'

From: GCIDE
  • Solidly \Sol"id*ly\, adv. In a solid manner; densely; compactly; firmly; truly. [1913 Webster]