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.
(..) He envisioned a steamer so grand in scale... ..that its supremacy would never be challenged. And here she is... ..willed into solid reality. Hear, hear. Salmon. You know l don't like that, Rose. She knows. We'll both have the lamb, rare, (..)1997 Titanic