Source : Webster's Revised Unabridged Dictionary (1913)

Advertent \Ad*vert"ent\, a. [L. advertens, -entis, p. pr. of
   advertere. See {Advert}.]
   Attentive; heedful; regardful. --Sir M. Hale. --
   {Ad*vert"ent*ly}, adv.

Source : WordNet®

advertent
     adj : giving attention [syn: {heedful}]