The antonyms for the word "steady-going" vary depending on the context of use. For instance, if we are describing a person, the antonyms would include adjectives such as erratic, volatile, unstable, flighty, unpredictable and capricious. Similarly, if we are referring to a situation or an event that is going smoothly, the antonyms for steady-going would be words such as turbulent, violent, tumultuous, or stormy. In business, the opposite of steady-going may be used to describe a risky or uncertain investment, whereas, in a relationship, it may denote unfaithful, inconsistent or unreliable behavior. Overall, the antonyms for steady-going largely depend on the context of the given situation.