Moving forward with the head first, or doing something recklessly without thinking ahead.
Formed from 'head' and the Old English '-long' (along), literally meaning 'along the head' or 'head foremost.' By the 14th century it came to mean acting rashly or impetuously.
The phrase 'headlong rush' perfectly captures an image—imagine literally diving forward with your head leading the way, which is exactly how reckless people charge into decisions!
Complete word intelligence in one call. Free tier — 50 lookups/day.