Definition of mobbishness in US English:

mobbishness

noun

  • Mobbish quality or nature. Also (without negative connotation): the tendency to go about in mobs or groups.

Origin

Early 20th century; earliest use found in James George Frazer (1854–1941), social anthropologist and classical scholar. From mobbish + -ness.

Pronunciation

mobbishness

/ˈmɒbɪʃnɪs/