1. Incapable of being modified in form or character or strength (especially by making less extreme)
   "these variations from custom are illogical, incomprehensible, and unmodifiable"

Antonym: modifiable

• Correggio
• Corregidor
• correlate
• correlated
• correlation
• correlation coefficient
• correlation matrix
• correlation table
• ireful
• Ireland
• Irelander
• Irena
• Irenaeus
• Irene Joliot-Curie
• irenic
• irenical
• Irenidae
• Iresine
• Iresine herbstii
• Iresine reticulata
• Iridaceae
• iridaceous
• iridaceous plant
• iridectomy
• iridesce