The term "made firm" implies the act of making something strong or stable. Antonyms for this phrase can include words such as unstable, weak, flimsy, flexible, or soft. Unstable refers to something that lacks stability or steadiness. Weak suggests a lack of strength or power. Flimsy describes something that is light, thin, or insubstantial. Flexible relates to something that is capable of bending or adapting to changes. Finally, soft denotes something that is not hard or solid, and lacks firmness. The antonyms for made firm are useful in language and can help convey specific meanings in sentences.