flat in WordNet English dictionary

1. lacking the expected range or depth; not designed to give an illusion or depth
   "a film with two-dimensional characters"; "a flat two-dimensional painting"
   two-dimensional  2-dimensional  flat 
   
2. lacking taste or flavor or tang
   "a bland diet"; "insipid hospital food"; "flavorless supermarket tomatoes"; "vapid beer"; "vapid tea"
   bland  flat  flavorless  flavourless  insipid  savorless  savourless  vapid 
   
3. lacking stimulating characteristics; uninteresting
   "a bland little drama"; "a flat joke"
   bland  flat 
   
4. not modified or restricted by reservations
   "a categorical denial"; "a flat refusal"
   categoric  categorical  flat  unconditional 
   
5. flattened laterally along the whole length (e.g., certain leafstalks or flatfishes)
   compressed  flat 
   
6. (of a musical note) lowered in pitch by one chromatic semitone
   "B flat"
   flat 
   
7. lacking contrast or shading between tones
   flat 
   
8. not reflecting light; not glossy
   "flat wall paint"; "a photograph with a matte finish"
   flat  mat  matt  matte  matted 
   
9. having a surface without slope, tilt in which no part is higher or lower than another
   "a flat desk"; "acres of level farmland"; "a plane surface"; "skirts sewn with fine flat seams"
   flat  level  plane 
   
10. horizontally level
    "a flat roof"
    flat 
    
11. commercially inactive
    "flat sales for the month"; "prices remained flat"; "a flat market"
    flat 
    
12. having lost effervescence
    "flat beer"; "a flat cola"
    flat 
    
13. having a relatively broad surface in relation to depth or thickness
    "flat computer monitors"
    flat 
    
14. stretched out and lying at full length along the ground
    "found himself lying flat on the floor"
    flat  prostrate 
    
15. sounded or spoken in a tone unvarying in pitch
    "the owl's faint monotonous hooting"
    flat  monotone  monotonic  monotonous 
    

1. a suite of rooms usually on one floor of an apartment house
   apartment  flat 
   
2. scenery consisting of a wooden frame covered with painted canvas; part of a stage setting
   flat 
   
3. a deflated pneumatic tire
   flat  flat tire 
   
4. freight car without permanent sides or roof
   flatcar  flatbed  flat 
   
5. a shallow box in which seedlings are started
   flat 
   
6. a musical notation indicating one half step lower than the note named
   flat 
   
7. a level tract of land
   "the salt flats of Utah"
   flat 
   

1. in a forthright manner; candidly or frankly
   "he didn't answer directly"; "told me straight out"; "came out flat for less work and more pay"
   directly  flat  straight  directly  flat  straight 
   
2. with flat sails
   "sail flat against the wind"
   flat  flat