Webster's English Dictionary

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giddy

gid.dy \'gid-e-\ aj or gid.died;  or gid.dy.ing [ME gidy mad, foolish, fr. 
   OE gydig possessed, mad; akin to OE g]od 1: lightheartedly silly : 
   FRIVOLOUS  2a: DIZZY  2b: causing dizziness  2c: whirling rapidly  - giddy 
   vb