Giddy/ˈɡɪdi/ Definition 1 of 2Pro Tip 1/3Physical Sensation Refers to a physical feeling, like spinning or losing balance, not just emotional excitement. The medication made her feel giddy and unsteady. Pro Tip 2/3Caused by Heights Often used when high up and feeling dizzy, such as on a tall ladder or building. Looking down from the cliff, he became giddy. Pro Tip 3/3Emotionally Overwhelmed Can describe being so happy or excited that you feel dizzy or lightheaded. She was giddy with joy at the news of her success.