Found 71 synonyms in 10 groups
  1. 1
    Meaning: crust
  1. 2
    Meaning: stabilise
  2. 3
    Meaning: steady
  3. 4
    Meaning: harden
  4. 5
    Meaning: coagulate
  5. 7
    Meaning: activity
  6. 8
    Meaning: turn to bone
  7. 9
    Meaning: process
  8. 10
    Meaning: strengthen

stiffen synonyms - English related words for stiffen