atrevido, bold, daring, fearless.
atribuir, to attribute, ascribe, charge to.
atribulado, afflicted, worried, distressed.
atrocidad, f., atrocity.
atrofiar(se), to waste away.
atronador, -a, thundering, deafening.
atronar (ue), to make a deafening noise (like thunder).
atroz, atrocious.
aturdido, thoughtless.
aturdimiento, perturbation, stupefaction.