Antonyms of verb flatten

1 of 3 senses of flatten

Sense 3
flatten, drop -- (lower the pitch of (musical notes))
       Antonym of sharpen (Sense 6)
      => sharpen -- (raise the pitch of (musical notes))

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb flatten

3 senses of flatten

Sense 1
flatten -- (make flat or flatter; "flatten a road"; "flatten your stomach with these exercises")
       => shape, form -- (give shape or form to; "shape the dough"; "form the young child's character")

Sense 2
flatten, flatten out -- (become flat or flatter; "The landscape flattened")
       => change shape, change form, deform -- (assume a different shape or form)

Sense 3
flatten, drop -- (lower the pitch of (musical notes))
       => change, alter, modify -- (cause to change; make different; cause a transformation; "The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue")

Antonyms of adj flattened

1 sense of flattened

Sense 1
planate, flattened -- (having been flattened)

INDIRECT (VIA linear, planar) -> cubic, three-dimensional -- (having three dimensions)
INDIRECT (VIA planar, cubic) -> linear, one-dimensional -- (of or in or along or relating to a line; involving a single dimension; "a linear measurement")

Similarity of adj flattened

1 sense of flattened

Sense 1
planate, flattened -- (having been flattened)
       => planar (vs. cubic) (vs. linear), two-dimensional -- (involving two dimensions)