The Collaborative International Dictionary of English v.0.48:

Dote \Dote\, v. i. [imp. & p. p. Doted; p. pr. & vb. n.
   Doting.] [OE. doten; akin to OD. doten, D. dutten, to doze,
   Icel. dotta to nod from sleep, MHG. t?zen to keep still: cf.
   F. doter, OF. radoter (to dote, rave, talk idly or
   senselessly), which are from the same source.] [Written also
   doat.]
   1. To act foolishly. [Obs.]
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            He wol make him doten anon right.     --Chaucer.
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   2. To be weak-minded, silly, or idiotic; to have the
      intellect impaired, especially by age, so that the mind
      wanders or wavers; to drivel.
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            Time has made you dote, and vainly tell
            Of arms imagined in your lonely cell. --Dryden.
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            He survived the use of his reason, grew infatuated,
            and doted long before he died.        --South.
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   3. To be excessively or foolishly fond; to love to excess; to
      be weakly affectionate; -- with on or upon; as, the mother
      dotes on her child.
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            Sing, siren, for thyself, and I will dote. --Shak.
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            What dust we dote on, when 't is man we love. --
                                                  Pope.
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The Collaborative International Dictionary of English v.0.48:

Doting \Dot"ing\, a.
   That dotes; silly; excessively fond. -- Dot"ing*ly, adv. --
   Dot"ing*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

doting
    adj 1: extravagantly or foolishly loving and indulgent; "adoring
           grandparents"; "deceiving her preoccupied and doting
           husband with a young captain"; "hopelessly spoiled by a
           fond mother" [syn: adoring, doting, fond]

Moby Thesaurus II by Grady Ward, 1.0:

86 Moby Thesaurus words for "doting":
   affectionate, aging, apish, asinine, batty, befooled, beguiled,
   besotted, brainless, buffoonish, childish, childlike, cockeyed,
   crazy, credulous, daffy, daft, dazed, dear, declining, decrepit,
   devoted, dizzy, doddering, doddery, doited, dumb, easily taken in,
   easy of belief, fading, fatuitous, fatuous, flaky, fond, fool,
   foolheaded, foolish, fuddled, futile, gaga, getting on, goofy,
   growing old, gulled, idiotic, imbecile, inane, inclined to believe,
   inept, infatuated, insane, kooky, loony, lovesome, mad, maudlin,
   moronic, nutty, overconfiding, overcredulous, overtrustful,
   overtrusting, sappy, screwy, senescent, senile, senseless,
   sentimental, silly, simple, sinking, stupid, superstitious,
   thoughtless, trustful, trusting, uncritical, undoubting,
   unskeptical, unsuspecting, unsuspicious, wacky, waning, wasting,
   wet, witless