Definition of over-bullishness in US English:

over-bullishness

noun

Stock Market
  • The quality or condition of being excessively bullish.

Origin

1930s; earliest use found in The New Statesman. From over- + bullishness, after over-bull.

Pronunciation

over-bullishness

/ˌəʊvəˈbʊlɪʃnɪs/