Financially, the company is '(as) solid as a rock'. [=the company is in very good condition]
a 'solidly' Republican area/suburb [=an area/suburb where most people vote for Republicans]
Environmentalists were 'solidly' [='completely'] opposed to drilling in the area.
(..) Okay. Not what I had in mind. Aw! Hey, look. The Golden Gate Bridge, isn't that great? It's not made up of solid gold like we thought, which is kind of disappointed. But still... I sure am glad you told me earthquakes are a myth, Joy. - Otherwise I be terrified right now. (..)2015 Inside Out