The word "un-adapted" means not adjusted or suited to a particular situation or condition. Its opposite or antonym is "adapted," which means suitable or adjusted to particular conditions. Other antonyms for "un-adapted" include "adaptive," "acclimated," "adjusted," "suited," and "fitting." These words suggest that something has been changed or modified to better fit a specific environment, context or purpose. For instance, someone who is "adapted" to a foreign culture is capable of living and functioning there without much difficulty. Overall, antonyms for "un-adapted" convey a sense of flexibility, resilience or versatility, which are valuable traits to have in a changing world.