“Insignificant” means lacking importance, value, or consequence. Some antonyms for “insignificant” are “significant”, “important”, and “substantial”.
“Significant” implies having meaning, importance, or impact. For example, “The discovery was of significant scientific value.” This shows that something is not insignificant but rather has a notable and meaningful presence.
“Important” indicates being of great consequence or value. “This decision is very important for our future.” Here, “important” emphasizes the opposite of being insignificant, highlighting the significance and weight of a matter.
“Substantial” suggests being of considerable size, amount, or importance. “There was a substantial improvement in his condition.” This antonym conveys a sense of solidity and importance, in contrast to the lack of substance associated with “insignificant”.