Most inelaborate means the simplest or least complicated. Therefore, antonyms for this word would be complex or elaborate. Other antonyms could be intricate, detailed, ornate, sophisticated, or intricate. The opposite of most inelaborate would be the most elaborate or complex. This would refer to something that is highly detailed, ornate, or sophisticated. An example of a sentence using the antonyms of most inelaborate could be, "The most elaborate wedding decoration included intricate flowers, ornate table settings, and detailed lighting, while the most inelaborate decoration only included a simple centerpiece.