Definitions for "Malefic"
The malefic planets are Mars and Saturn. The Waning Moon (decreasing in light) is considered to be Malefic. In traditional astrology these planets produce a negative influence.
having or exerting a malignant influence; "malevolent stars"; "a malefic force"
a planet whose natural influence leads to extremes and imbalance
Doing mischief; causing harm or evil; nefarious; hurtful.