Flat

adjective

1. lying at full length or spread out upon the ground : prostrate
2. clearly unmistakable
3. not varying : fixed
4. having no fraction either lacking or in excess : exact
5. not varying significantly throughout its rangeof a frequency response
6. lacking in animation, zest, or vigor : dull
7. lacking flavor : tasteless
8. lacking effervescence or sparkle
9. commercially inactive
10. characterized by no significant rise or decline from one period to anotheralso
11. lacking air : deflatedof a tire
12. dead sense 3c, dischargedchiefly British
13. utterly ruined or destroyed
14. lowered a half step in pitchof a tone
15. lower than the proper pitch
16. pronounced as in bad or batof the vowel a
17. having a low trajectory (see trajectory sense 1)
18. made so as to give little or no spin to the ballof a tennis stroke
19. not having an inflectional ending
20. tautof a sail
21. uniform in hue or shade
22. having little or no illusion of depth
23. lacking contrastof a photograph or negative
24. resting with a surface against something
25. lacking shadows or contoursof lighting conditions
26. free from gloss : having a nonreflective finish
27. two-dimensional sense 3
28. of, relating to, or used in competition on the flat
29. having a mass such that expansion halts only after infinite time and collapse never occursof a universe
30. having a continuous horizontal surface
31. being or characterized by a horizontal line or tracing without peaks or depressions
32. having a relatively smooth or even surface
33. arranged or laid out so as to be level or even
34. having the major surfaces essentially parallel and distinctly greater than the minor surfaces
35. very low and broadof the heel of footwear
36. having a flat heel or no heelalso, of footwear