unchangeable

/ənˈtʃeɪndʒəbəl/

/ənˈtʃeɪndʒəbəl/

Anything that doesn't alter or shift over time is unchangeable, like the unchangeable rules at your school or your unchangeable conviction that pistachio is the tastiest flavor of ice cream.

Things that can't be changed are unchangeable, and this adjective tends to be used for describing really big ideas, like the unchangeable laws of the universe or the unchangeable nature of love. You can use it for anything that seems steadfast, firm, or permanent, like your unchangeable affection for your best friend or your sister's unchangeable insistence that she has to ride in the front seat.

Definitions of unchangeable

1. adjective

   not changeable or subject to change
   “"a fixed and unchangeable part of the germ plasm"-Ashley Montagu”

   “the unchangeable seasons”

   “one of the unchangeable facts of life”

   synonyms:

   changeless, unalterable

   remaining the same for indefinitely long times

   confirmed

   of persons; not subject to change

   fixed, frozen

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

   carved in stone, set in stone

   no longer changeable

   stable, static, unchanging

   showing little if any change

   constant

   steadfast in purpose or devotion or affection

   lasting, permanent

   continuing or enduring without marked change in status or condition or place

   antonyms:

   changeable

   such that alteration is possible; having a marked tendency to change

   adjustable

   capable of being regulated

   astatic

   not static or stable

   checkered

   marked by changeable fortune

   distortable

   capable of having the meaning altered or twisted

   erratic, fickle, mercurial, quicksilver

   liable to sudden unpredictable change

   fluid, unstable

   subject to change; variable

   fluid, mobile

   affording change (especially in social status)

   jittering

   undergoing small rapid variations

   kaleidoscopic, kaleidoscopical

   continually shifting or rapidly changing

   mobile

   capable of changing quickly from one state or condition to another

   open-ended

   allowing for future changes or revisions

   quick-change

   adept at changing from one thing to another especially changing costumes

   quick-drying

   of a liquid substance that dries quickly

   reversible

   capable of assuming or producing either of two states

   volatile

   tending to vary often or widely

   inconstant

   likely to change frequently often without apparent or cogent reason; variable

   exchangeable

   suitable to be exchanged