causing fear or anxiety by threatening great harm; "a dangerous operation"; "a grave situation"; "a grave illness"; "grievous bodily harm"; "a serious wound"; "a serious turn of events"; "a severe case of pneumonia"; "a life-threatening disease"
involving or causing danger or risk; liable to hurt or harm; "a dangerous criminal"; "a dangerous bridge"; "unemployment reached dangerous proportions"
highly or violently reactive; "sensitive and highly unstable compounds"
disposed to psychological variability; "his rather unstable religious convictions"
lacking stability or fixity or firmness; "unstable political conditions"; "the tower proved to be unstable in the high wind"; "an unstable world economy"
marked by lack of definite plan or regularity or purpose; jumping from one thing to another; "desultory thoughts"; "the desultory conversation characteristic of cocktail parties"