solid

A substance in the fundamental state of matter that retains its size and shape without need of a container (as opposed to a liquid or gas).

A three-dimensional figure (as opposed to a surface, an area, or a curve).

A favor.

"I owe him; he did me a solid last year."

(of an object or substance) That can be picked up or held, having a texture, and usually firm. Unlike a liquid or a gas.

"Almost all metals are solid at room temperature."

Large in size, quantity, or value.

Similar: massive, substantial

Lacking holes, hollows or admixtures of other materials.

"solid chocolate"

Solidly.

Without spaces or hyphens.

"Many long-established compounds are set solid."