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Answer: Option 4
Vigilant : keeping careful watch for possible danger or difficulties. Innocent : not guilty of a crime or offence. Ignorant : lacking knowledge or awareness in general; uneducated or unsophisticated. Irresponsible : (of a person, attitude, or action) not showing a proper sense of responsibility. Careless : not giving sufficient attention or thought to avoiding harm or errors. Antonym of Vigilant is Careless
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