The word "most flanked" refers to something that is surrounded or bordered by other things on either side. Its antonyms include words like unbounded, unlimited, infinite, and boundless, which describe something without any boundaries or limits. Other antonyms for "most flanked" are lonely, isolated, deserted, and solitary, which describe something that is alone or without any companionship. Conversely, crowded, packed, dense, and congested are also antonyms of "most flanked," which describe something that is full of people or things and lacks space. These words can be used interchangeably to convey different meanings and emotions.