KEY: Both.
SYN: Twain.
ANT: Neither.

• Inexpedient
• Inexpensive, [See EXPENSIVE]
• Inexperience
• Inexpert, [See EXPERT]
• Inexpiable
• Inexplicable
• Inexpressible, [See INDESCRIBABLE]
• Inexpressive
• Inextension, [See EXTEND_and_SPACE]
• Inextensive, [See RECORD]
• Inextinguishable, [See EXTINGUISH]
• Inextricable
• Infallible, [See FALLIBLE]
• Infamous
• Infamy
• Infantile
• Infatuation
• Infect
• Infection
• Infectious, [See CONTAGIOUS]
• infelicity
• Inference
• Inferiority
• Infernal, [See ANGELIC]
• Infertility