The phrase "faulty action" can pertain to any action that is not adequate or correct in some way. Synonyms for this phrase could include "ineffective behavior," "improper conduct," "error in execution," or "flawed performance." Other words that may be used to describe similar actions might include "mistake," "malfunction," "defective output," or "substandard behavior." These words can be useful in a variety of contexts, whether discussing work performance, sports, or other daily activities. When we make a faulty action, it can lead to negative consequences, so it's important to identify and correct these actions as soon as possible.