|Origin:||gydig 'mentally ill'|
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.
feeling silly, happy, and excited, or showing this feeling
Sheila felt giddy with excitement.
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.
silly and not interested in serious things:
Fiona's very pretty but a bit giddy.
—giddiness noun [uncountable]