fair-weather vs two-timing

fair-weather

adj

  • Suitable for use only during fair weather 

  • Dependable only in the absence of trouble. 

two-timing

noun

  • The practice of being sexually or romantically unfaithful. 

adj

  • Sexually or romantically unfaithful. 

How often have the words fair-weather and two-timing occurred in a corpus of books? (source: Google Ngram Viewer )