Argus-eyed is an adjective that means to be observant, watchful, or vigilant. Its antonyms are words that show the opposite meaning of argus-eyed. Some of the antonyms for argus-eyed are oblivious, inattentive, careless, negligent, and heedless. These words indicate a lack of attention or focus, which is entirely different from being argus-eyed. An individual who is oblivious, inattentive, or careless is likely to miss critical information or details. Being heedless and negligent can be problematic in various situations, especially when safety is involved. Hence, it is essential to cultivate a sense of alertness and attentiveness to avoid being the antonym of argus-eyed.