1. Threatening or foreshadowing evil or tragic developments
   - baleful, forbidding, menacing, minatory, ominous, sinister, threatening

See also: alarming

• Regius professor
• Reglaecus
• reglet
• regnal
• regnant
• regnellidium
• Regnellidium diphyllum
• rego
• regorge
• regosol
• regrade
• regress
• regression
• regression analysis
• regression coefficient
• regression curve
• regression equation
• regression line
• regression of y on x
• regression toward the mean
• regressive
• regret
• regretful
• regretfully
• regrets