intently, carefully, patiently, anxiously, raptly, closely, disinterestedly, nervously, impassively, expectantly, minutely, impatiently, apprehensively, warily, silently, beseechingly, pensively, appreciatively, calmly, placidly, obediently, mutely, avidly, fixedly, earnestly, dispassionately, keenly, eagerly, worriedly, powerlessly, soberly, tensely, solemnly, studiously, cautiously, searchingly, contemplatively, questioningly, balefully, dutifully, meditatively, thoughtfully, deferentially, devotedly, conscientiously, passively, sceptically, inquisitively, quizzically, absently, obsessively, courteously, wearily, sympathetically, scrupulously, meticulously, languidly, fearfully, interestedly, discreetly, vacantly, receptively, indifferently, serenely, stiffly, diligently, adoringly, faithfully, considerately, unobtrusively, vigilantly, intensively, unhurriedly, tenderly, skeptically, idly, helplessly, energetically, laboriously, softly, enviously, excitedly, wordlessly, hungrily, rigorously, stolidly, amusedly, responsively, tolerantly, contentedly, mournfully, sombrely, reverentially, aloud, demurely, reservedly, worshipfully

attender, auditor, consider, hearer, hearing, keep tabs on, listener, listening, observe, regard, watch

paying attention, with attention