Webster's 1828 Dictionary
GIDDINESS
n.The state of being giddy or vertiginous; vertigo; a sensation of reeling or whirling, when the body loses the power of preserving its balance or a steady attitude, or when objects at rest appear to reel, tremble or whirl; a swimming of the head. 1. Inconstancy; unsteadiness; mutability.
2. Frolic; wantonness; levity.
Webster's 1913 Dictionary
GIDDINESS
GIDDINESS Gid "di *ness, n.
Defn: The quality or state of being giddy.
New American Oxford Dictionary
giddiness
gid di ness |ˈgidēnəs ˈɡɪdinəs | ▶noun 1 a sensation of whirling and a tendency to fall or stagger; dizziness: symptoms include nausea, vomiting, and giddiness. 2 a state of excitable frivolity. the fans can be forgiven their giddiness.
Oxford Dictionary
giddiness
gid ¦di |ness |ˈgɪdɪnɪs | ▶noun [ mass noun ] 1 a sensation of whirling and a tendency to fall or stagger; dizziness: symptoms include nausea, vomiting, and giddiness. 2 a state of excitable frivolity. the fans can be forgiven their giddiness.
Oxford Thesaurus
giddiness
giddiness noun I nearly fell down with giddiness: dizziness, light-headedness, loss of balance /equilibrium, spinning /swimming of the head; faintness, weakness at the knees, unsteadiness, shakiness, wobbliness; Scottish mirligoes, dwalm; informal wooziness, legs like jelly, rubbery legs; technical megrim, sturdy, scotoma; archaic turnsick; rare vertiginousness. ANTONYMS steadiness.