1 hard and firm/not hollow
VERBS be, feel, look, seem | become, go If you put it in the freezer, it will go solid.
ADV. extremely, very | absolutely, completely | almost, practically | quite | enough The ice felt solid enough. | apparently, seemingly
2 reliable and strong
VERBS appear, be, look, seem | become | remain
ADV. 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.