The antonyms of "in-attentive" include "attentive," "careful," "alert," "focused," "observant," "vigilant," "attentive," "wary," "thoughtful," and "mindful." These words describe people who are attentive, watchful, and alert to their surroundings. Being attentive means giving full attention, being careful and cautious, and paying close attention to details. Someone who is attentive will notice things that others might miss, and take care to ensure they are doing things correctly. Thus, antonyms of inattentive describe individuals who are engaged with the world, positively self-aware, and confident in their ability to make a difference.