Select the most appropriate ANTONYM of the given word.

Adequate

Inadequate

The most appropriate antonym of the word adequate is inadequate.

• Adequate means "sufficient or enough to meet a need."
• Inadequate means "not sufficient or enough to meet a need."

The other words do not have the same meaning as adequate, so they are not its antonyms.

• Able means "having the necessary ability or skill to do something."
• Commensurate means "corresponding in size, amount, or degree."
• Sufficient means "enough to meet a need."