The DICT Development Group

  74 Moby Thesaurus words for "punctual":
     accurate, active, alert, apt, attentive, careful, close, compliant,
     conforming, conscientious, conscionable, constant, correct,
     critical, decisive, delicate, demanding, detailed, devoted, devout,
     duteous, dutiful, exact, exacting, exigent, expeditious, exquisite,
     faithful, fastidious, fine, finical, finicking, finicky, fussy,
     heedful, immediate, instant, instantaneous, loyal, meticulous,
     mindful, minute, narrow, nice, observant, on the dot, on time,
     overconscientious, overscrupulous, painstaking, particular,
     practicing, precise, precisianistic, precisionistic, prompt,
     punctilious, quick, ready, refined, regardful, religious, rigid,
     rigorous, scrupulous, scrutinizing, speedy, strict, subtle,
     summary, swift, tender-conscienced, timely, true