Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: gydig 'mentally ill'

giddy

 adjective
     
gid‧dy
1 feeling slightly sick and unable to balance, because everything seems to be moving [= dizzy]:
Greg stared down from the seventh floor and began to feel giddy.
2 feeling silly, happy, and excited, or showing this feeling
giddy with
Sheila felt giddy with excitement.
3

giddy heights

a situation in which you have a lot of success:
Although she had been quite a successful model, she had never reached the giddy heights of the Paris fashion world.
4 old-fashioned silly and not interested in serious things:
Fiona's very pretty but a bit giddy.
—giddily adverb
—giddiness noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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