mindful

Synonyms: alert alive to apprehensive au courant be up on cagey careful cautious chary cognizant conscientious conscious conversant heedful in the know know all the answers knowing know ins and outs knowledgeable observant observative observing on one’s toes on the ball on the job on to plugged in regardful respectful sensible solicitous thoughtful tuned in vigilant wary watchful with eyes peeled

Antonyms: absent-minded careless heedless inattentive unaware