atentamente, attentively.
atento, -a, attentive.
aterrador, -ra, terrifying.
Atlántico, -a, Atlantic.
atolondrado, -a, flighty, scatter-brained.
atónito, -a, surprised, astonished.
atraer, (like traer), to draw down.
atrás, back, backward.
atravesar, to traverse, cross.
atreverse, to dare.