The term "was the lookout" implies someone who is watching out for potential danger or guarding something. Antonyms for this phrase could include words like careless, inattentive, oblivious, unaware, or unobservant. These words suggest a lack of vigilance or attention, indicating that the person in question is not paying proper attention to their surroundings or responsibilities. Other antonyms might include words like distracted, preoccupied, absent-minded, or unconcerned, all of which describe someone who is not fully present or engaged in their task. In any case, the opposite of "was the lookout" would be a state of neglect, disinterest, or inattention.