permanent

Lasting or remaining without essential change.

Not expected to change in status, condition, or place.

Any of several long-lasting hair styles usually achieved by chemical applications that straighten, curl, or wave the hair.

Lasting or intended to last indefinitely; fixed or enduring in character, condition, state, position, occupation, use, or the like; remaining or intended to remain unchanged or unremoved; not temporary or subject to change; abiding.

In zoology, always present in a species or group.