The antonyms for the term "more toughened" are soft, tender, delicate, fragile, and sensitive. While toughened refers to something becoming more strong and resilient, the polar opposite of it denotes something weak, brittle, and easily breakable. For instance, a soft and delicate fabric could not be described as more toughened, as it lacks strength and endurance. Similarly, a fragile piece of glass or a sensitive plant cannot withstand harsh conditions and be considered as more toughened. These antonyms highlight the opposite qualities of being strong and durable, implying that certain things require gentleness and care instead of being toughened.