Collocations for solid - adj.

be, feel, look, seem | become, go
If you put it in the freezer, it will go solid.

extremely, very | absolutely, completely | almost, practically | quite | enough
The ice felt solid enough.

apparently, seemingly

appear, be, look, seem | become | remain

extremely, really, very | absolutely, rock
Support for the plan remained rock solid.

fairly, pretty
There is pretty solid evidence to show that the disease is caused by poor hygiene.