Most leading edge refers to being at the forefront of innovation, technology or progress. Its antonyms would be outdated, old-fashioned, backward, or behind the times. If something is not the most leading edge, it could be considered average, common or run-of-the-mill. An opposite of being innovative or advanced could also be traditional or conservative. In today's fast-paced world, it's essential to stay current and informed about the latest advancements and trends. Companies and individuals need to strive to be at the forefront of their fields, rather than falling behind and being left in the dust.