The phrase "on-a-tear" typically denotes someone who is intensely focused and successful in achieving their goals. However, if we look for antonyms to this phrase, we may consider words like "sluggish," "unmotivated," or "ineffective." These words imply a lack of progress or success, and can suggest that a person is struggling to get things done. Other antonyms could include "stagnant," "uncertain," "halted," or "stalled." While "on-a-tear" suggests a highly productive and successful state, its antonyms can reveal the opposite, highlighting a slowed-down or weakened state of being.