onomatopoeical (adjective) echoic: imitating in sound
Sinonime: acute,
agog,
alert,
anxious, attentive,
aware,
cautious,
circumspect,
guarded,
keen, looking for, looking to, observant, on alert, on guard, on the ball, on the job, on the lookout, on the qui vive, on toes, open-eyed,
sharp, sleepless, unsleeping, waiting on, wakeful, wary, wide-awake, with eyes peeled, with weather eye open
Antonime: careless,
impulsive,
inattentive, indiscreet,
negligent