Select the most appropriate word to fill in the blank.

The scientist, who is known for his ______ ideas on space travel, is much admired.

revolutionary

The most appropriate word to fill in the blank is revolutionary.

• Ridiculous means absurd or nonsensical.
• Anarchist means someone who believes in the absence of government.
• Revolutionary means someone who advocates for radical change.
• Malicious means intending or intended to do harm.