noun, noun which may take the genitive case particle 'no', adverb
lightheadedness; disorientation; wobbliness; staggering
Describes a sensation of dizziness, unsteadiness, or physical instability, often from illness, fatigue, or intoxication. Can be used as a noun, no-adjective, or adverb.
熱でふらつきがひどくて、まっすぐ歩けなかった。
I had such bad lightheadedness from the fever that I couldn't walk straight.
立ち上がったときにふらつきを感じた。
I felt dizzy when I stood up.
Derived from the verb ふらつく (to feel dizzy, to stagger), which is of mimetic origin. The noun form ふらつき nominalizes the action or state.