solid

adjective

1. tending to keep its form rather than to flow or spread out like a liquid or gas; relatively firm or compact
2. filled with matter throughout; not hollow
3. 1. having the three dimensions of length, breadth, and thickness: prisms and other solid figures
   2. dealing with bodies or figures in three dimensions
4. 1. firm, strong, and dependable: a solid structure
   2. substantial, sound, and reliable: solid reasoning
   3. sturdy or vigorous: a solid build, a solid punch
5. serious; not superficial or trivial: solid scholarship
6. complete, thoroughgoing, or genuine: solid satisfaction
7. 1. having no breaks or divisions: a solid line of fortifications
   2. written or printed without a hyphen: a solid compound
8. characterized by no pauses or interruptions: to talk for a solid hour
9. 1. of one or the same color, material, or consistency throughout: a solid walnut table
   2. consisting of one unalloyed metal throughout; also, containing no more alloy than is necessary to insure hardness: said of gold, etc.
10. ☆ characterized by or showing complete unity; unanimous: a solid vote
11. thick or dense in appearance or texture: a solid fog
12. firm or dependable: a solid friendship
13. ☆ Informal having a firmly favorable or good relationship: to be in solid with someone
14. Informal healthful and filling: a solid meal
15. ☆ Slang very good; excellent: a solid dance band
16. Printing set without spaces between the lines of type

noun

1. a substance that is solid, not a liquid or gas
2. an object or figure having or represented as having length, breadth, and thickness