levelheaded vs manic

levelheaded

manic

adj
  • Suffering from mania, the state of an abnormally elevated or irritable mood, arousal, and/or energy levels. 

  • Of or pertaining to someone who exhibits mania or craziness; wicked. 

noun
  • A person exhibiting mania. 

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