Rash
WordNet
adjective
(1) Marked by defiant disregard for danger or consequences
"Foolhardy enough to try to seize the gun from the hijacker"
"Became the fiercest and most reckless of partisans"-Macaulay
"A reckless driver"
"A rash attempt to climb Mount Everest"
(2) Imprudently incurring risk
"Do something rash that he will forever repent"- George Meredith
noun
(3) A series of unexpected and unpleasant occurrences
"A rash of bank robberies"
"A blizzard of lawsuits"
(4) Any red eruption of the skin