Adjective stiffened has 2 senses
  1. stiffened - made or become difficult to move or bend; "felt the pain of stiffened joints"
    Antonyms:
    flexible, flexile (indirect, via inflexible)
  2. stiffened - stiffened or reinforced with wire; "stiffened brassieres"
    Antonym:
    wireless (indirect, via wired)
,Verb stiffen has 3 senses
  1. stiffen - become stiff or stiffer; "He stiffened when he saw his boss enter the room"
    --1 is one way to
    change
    Antonyms: loosen, relax, loose
    Derived form: noun stiffening1
    Sample sentences:
    Something ----s
    Somebody ----s
  2. stiffen - make stiff or stiffer; "Stiffen the cream by adding gelatine"
    --2 is one way to
    change, alter, modify
    Antonyms: loosen, loose
    Derived forms: noun stiffener1, noun stiffening2
    Sample sentences:
    Somebody ----s something
    Something ----s something
  3. stiffen, tighten, tighten up, constrain - restrict; "Tighten the rules"; "stiffen the regulations"
    --3 is one way to restrict, restrain, trammel, limit, bound, confine, throttle
    Sample sentence:
    Somebody ----s something
,
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