giddy vs unstable

giddy

adj
  • Unable to concentrate or think seriously; easily excited; impulsive; also, lightheartedly silly; frivolous. 

  • Joyfully elated; overcome with excitement or happiness. 

  • Causing or likely to cause dizziness or a feeling of unsteadiness. 

  • Feeling great anger; furious, raging. 

  • Of an animal, chiefly a sheep: affected by gid (“a disease caused by parasitic infestation of the brain by tapeworm larvae”), which may result in the animal turning around aimlessly. 

  • Feeling a sense of spinning in the head, causing a perception of unsteadiness and being about to fall down; dizzy. 

  • Moving around something or spinning rapidly. 

verb
  • To make (someone or something) dizzy or unsteady; to dizzy. 

  • To become dizzy or unsteady. 

unstable

adj
  • Unpredictable. 

  • Readily decomposable. 

  • Not stable. 

  • Radioactive, especially with a short half-life. 

  • Fickle. 

  • Having a strong tendency to change. 

  • Fluctuating; not constant. 

verb
  • To release (an animal) from a stable. 

How often have the words giddy and unstable occurred in a corpus of books? (source: Google Ngram Viewer )