unchangeably
1. [ adverb ] in an unalterable and unchangeable manner
Synonyms: unassailably immutably unalterably
Examples:

"his views were unchangeably fixed"

Related terms: unchangeable unalterable ironclad immutable immutable ironclad
Similar spelling:   unchangeable
  unexchangeable
  unchangeability
  unchanged
  unchanging
  unchangingness
  uncannily