permanent

nouns

a series of waves in the hair made by applying heat and chemicals

perm, permanent, permanent wave

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

"permanent secretary to the president"; "permanent address"; "literature of permanent value"

lasting, permanent

is derived from

is derived from

antonym

not capable of being reversed or returned to the original condition

"permanent brain damage"

permanent

is similar to

incapable of being reversed

"irreversible momentum toward revolution"