Antonyms for the phrase "walk unsteadily" include words that describe a strong, stable, and steady gait. These words could include "march," "stride," "saunter," or "tread." Each of these words implies a sense of confidence and purpose in movement, in contrast to the unsteady, uncertain movement of someone who is walking unsteadily. A march, for instance, suggests a military discipline and strength, while a stride implies a confident and purposeful walk. A saunter or a tread carries connotations of relaxation, ease, and a lack of uncertainty. When looking for words with opposite meanings to walk unsteadily, it's important to focus on words that convey strength, stability, and confidence.