The antonyms for the phrase "were on alert" include words like relaxed, calm, carefree, nonchalant, indifferent, and blase. These antonyms signify a sense of ease, lack of tension or stress, and a general feeling of being unbothered. Being on alert implies a state of readiness, preparedness, and vigilance, usually in response to a potential danger or threat. The opposite of being on alert is being off-guard, which signifies a lack of attention or awareness, making one vulnerable to danger. In any situation, being prepared is key, and understanding the antonyms for "being on alert" can help us appreciate the difference between being safe and letting our guard down.