The word "wimpiest" refers to lacking in courage, strength or determination. Some antonyms for the word "wimpiest" include brave, courageous, bold, strong, fearless, determined, confident, resilient, sturdy, and tough. These adjectives denote qualities that are the opposite of the characteristics associated with weakness and timidity. Using these antonyms to describe a person, a situation, or an object, can give a clear image of its traits and qualities. For instance, instead of calling someone "wimpy," you can aptly describe them as "brave" or "determined" to portray their courage and resilience.