likely to cause danger

hazardous, troubling

(a substance) that can explode

volatile, dangerous

dangerous

dangerous, unpredictable

doing harm secretly or unseen

sneaky, tricky

filled with, engaged in, mischief

devilish, wicked

threatening

menacing, foreboding

uncertain; unsafe; depending on chance

tricky, doubtful

(of a person) without established place in society

dangerous, precarious

(of a surface) smooth, wet, polished etc so that it is difficult to stand or to move on, or hold; needing care

smooth, slick

not safe

dangerous

not settled

bothered, upset