Answer: shrewder

AnswerCrossword Clue
SHREWDERNot so dumb
SHREWDERMore astute
SHREWDERMore cagey
shrewder(of a blow) Severe
shrewderSHREWD, having keen insight
shrewderHaving or showing sharp powers of judgment; astute
shrewderMischievous; malicious
shrewder(esp. of weather) Piercingly cold