Steeliest is an adjective that describes something as being tough and strong, often referring to metal. Antonyms for this word include words like weak, flimsy, frail, fragile, and delicate. Weak refers to something that lacks strength or power. Flimsy and frail describe something that is easily damaged or broken. Fragile is an antonym that emphasizes the delicate nature of something. Delicate suggests something that is easily damaged and requires gentle handling. All of these antonyms are the opposite of steeliest, signifying products or things that are not strong, sturdy, or tough.