unprompted

adj

Etymology: Etymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Germanic *un- Proto-West Germanic *un- Old English un- Middle English un- English un- English prompted English unprompted From un- + prompted.

1. Not prompted; not urged or instigated; spontaneous.

   “The unprompted, rapid, and reliable emergence of hierarchical relationships within human social groups (Gruenfeld & Tiedens, 2010; Leavitt, 2005) means that differences in social status exist in perhaps all human social environments (Anderson & Kilduff, 2009; Gould, 2002; Ridgeway, 1991).”

   “Donald Trump’s frequently bizarre public appearances, which this month have seen the president claim, wrongly, that his uncle knew the Unabomber and rant unprompted about windmills on his recent trip to the UK, have once again raised questions about his mental acuity, experts say.”