threatening as in threatening or foreshadowing evil or tragic developments

• "a baleful look"
• "forbidding thunderclouds"
• "his tone became menacing"
• "ominous rumblings of discontent"
• "sinister storm clouds"
• "a sinister smile"
• "his threatening behavior"
• "ugly black clouds"
• "the situation became ugly"

Synonyms

• balefuldeadly or sinister; threatening or foreshadowing evil or tragic developments
• forbiddingan official prohibition or edict against something ; harshly uninviting or formidable in manner or appearance; threatening or foreshadowing evil or tragic developments
• menacingthreatening or foreshadowing evil or tragic developments
• minaciousthreatening or foreshadowing evil or tragic developments
• minatorythreatening or foreshadowing evil or tragic developments
• ominousthreatening or foreshadowing evil or tragic developments; presaging ill fortune
• sinisterthreatening or foreshadowing evil or tragic developments; stemming from evil characteristics or forces; on or starting from the wearer's left

threatening as in darkened by clouds

• "a heavy sky"

Synonyms

• heavyslowly as if burdened by much weight; an actor who plays villainous roles ; a serious (or tragic) role in a play ; of comparatively great physical weight or density; unusually great in degree or quantity or number; of the military or industry; marked by great psychological weight; usually describes a large person who is fat but has a large frame to carry it ; (used of soil) compact and fine-grained; darkened by clouds; of great intensity or power or force; (physics, chemistry) being or containing an isotope with greater than average atomic mass or weight; (of an actor or role) being or playing the villain; permitting little if any light to pass through because of denseness of matter; of relatively large extent and density; made of fabric having considerable thickness; prodigious; full and loud and deep; given to excessive indulgence of bodily appetites especially for intoxicating liquors; of great gravity or crucial import; slow and laborious because of weight; large and powerful; dense or inadequately leavened and hence likely to cause distress in the alimentary canal; sharply inclined; full of; requiring or showing effort; characterized by effort to the point of exhaustion; lacking lightness or liveliness; (of sleep) deep and complete; in an advanced stage of pregnancy
• loweringdarkened by clouds; the act of causing to become less ; the act of causing something to move to a lower level
• sullenshowing a brooding ill humor; darkened by clouds