Select the most appropriate ANTONYM of the given word.

INTENTIONAL

accidental

The most appropriate antonym of the word intentional is accidental.

• Intentional means "done or brought about deliberately."
• Accidental means "happening by chance or unexpectedly; unintended."

The other words do not have the opposite meaning of intentional.

• Calculated means "done or planned with careful thought and calculation."
• Voluntary means "done or undertaken of one's own free will."
• Designed means "having a specific purpose or plan."