Modifiable and Rigid

Modifiable adjective - Capable of being modified in form or character or strength (especially by making less extreme).

Rigid is an antonym for modifiable in able and usually willing to change topic.

Nearby Words: modify, modification, modified, modifier

Rigid adjective - Not allowing for any exceptions or loosening of standards.

Modifiable is an antonym for rigid.

Nearby Words: rigor, rigidity, rigidly