"On qui vive" is a French phrase meaning to be alert or watchful. Antonyms for this phrase would include words like oblivious, inattentive, unobservant, and careless. These words all indicate a lack of attention or awareness, which is the opposite of being on qui vive. Other antonyms might include words like complacent, indifferent, apathetic, and unconcerned. These words all imply a sense of disinterest or detachment, which is the opposite of being alert and vigilant. In short, antonyms for on qui vive describe a state of mind that is the polar opposite of watchfulness and attentiveness.