Choose the option opposite in meaning to the word or phrase underlined. Everyone thought the politician was invincible.

To find the word with an opposite meaning (antonym) to the underlined word "invincible," we first need to understand its meaning. The word invincible means too powerful to be defeated or overcome.

1. The word invisible means something that cannot be seen. This is not related to power or the ability to be defeated, hence it's not opposite to "invincible."

2. The word unconquerable means impossible to defeat. This is a synonym, not an antonym, of "invincible."

3. The word vindictive means having a strong or unreasoning desire for revenge. This is unrelated to being unbeatable and thus is not the antonym of "invincible."

4. The word surmountable means able to be overcome or conquered. This is the direct opposite of "invincible," which means too powerful to be defeated.

Therefore, the word that is opposite in meaning to invincible is surmountable because it implies that something can be overcome or defeated.