WordRel.com

• securely placed or fastened or set

  antonym	unfixed
  derivation	fixednessfixity
  also	secure
  similar	fastfirmgeostationarygeosynchronousimmobileleadedstationarytapedunadjustable

• (of a number) having a fixed and unchanging value

  derivation	fixedness
  similar	determinate

• fixed and unmoving

  synonym	rigidset
  derivation	fixednessfixity
  similar	nonmovingunmoving

• incapable of being changed or moved or undone; e.g. "frozen prices"

  synonym	frozen
  derivation	fixity
  similar	unchangeable