flattened

(verb) make flat or flatter. Synonyms: flatten. Examples: "Flatten a road." "Flatten your stomach with these exercises."

(verb) become flat or flatter. Synonyms: flatten, flatten out. Example: "The landscape flattened."

(verb) lower the pitch of (musical notes). Synonyms: flatten, drop.

(adj) having been flattened. Synonyms: planate.