Select the most appropriate ANTONYM of the given word.

Assist

Obstruct

The most appropriate antonym of the word "assist" is obstruct.

• Assist means to help or give support to someone.
• Obstruct means to block or hinder someone's progress.

The other words are not antonyms of "assist" because they have different meanings.

• Support means to provide help or encouragement to someone.
• Conceal means to hide or keep something secret.
• Decline means to refuse or reject something.