sinister, baleful, malign mean seriously threatening evil or disaster. sinister suggests a general or vague feeling of fear or apprehension on the part of the observer <a sinister aura haunts the place>. baleful imputes perniciousness or destructiveness to something whether working openly or covertly <exerting a corrupt and baleful influence>. malign applies to what is inherently evil or harmful <the malign effects of racism>.
SINISTERLY Defined for Kids
Definition of SINISTER for Kids
: threatening evil, harm, or danger <We heard sinister rumors.>
:1evil 1, corrupt<We feared he would do something far more sinister.>