"flattest" in the adjective sense
1. flat, level, plane
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"
2. flat
having a relatively broad surface in relation to depth or thickness
"flat computer monitors"
3. categoric, categorical, flat, unconditional
not modified or restricted by reservations
"a categorical denial"
"a flat refusal"
4. flat, prostrate
stretched out and lying at full length along the ground
"found himself lying flat on the floor"
5. flat
lacking contrast or shading between tones
6. flat
of a musical note) lowered in pitch by one chromatic semitone
"B flat"
7. compressed, flat
flattened laterally along the whole length (e.g., certain leafstalks or flatfishes)
8. bland, flat, flavorless, flavourless, insipid, savorless, savourless, vapid
lacking taste or flavor or tang
"a bland diet"
"insipid hospital food"
"flavorless supermarket tomatoes"
"vapid beer"
"vapid tea"
9. bland, flat
lacking stimulating characteristics uninteresting
"a bland little drama"
"a flat joke"
10. flat
having lost effervescence
"flat beer"
"a flat cola"
11. flat, monotone, monotonic, monotonous
sounded or spoken in a tone unvarying in pitch
"the owl's faint monotonous hooting"
12. flat
horizontally level
"a flat roof"
13. two-dimensional, 2-dimensional, flat
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"
14. flat, mat, matt, matte, matted
not reflecting light not glossy
"flat wall paint"
"a photograph with a matte finish"
15. flat
commercially inactive
"flat sales for the month"
"prices remained flat"
"a flat market"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
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