THESAURUS
advertent
agog, alert, all ears, all eyes, assiduous, attentive, aware, careful, concentrated, conscious, diligent, earnest, finical, finicking, finicky, heedful, intense, intent, intentive, meticulous, mindful, nice, niggling, observant, observing, on the ball, on the job, open-eared, open-eyed, openmouthed, regardful, watchful