IPA: /ˈslɔːtə.rəs/
KK: /ˈslɔːtərəs/
Describing something that is likely to cause or involve killing, especially in a violent or brutal way.
The slaughterous nature of the battle left many in shock.
Slaughterous → It is formed from "slaughter" (from Old English *sleaht*, meaning the act of killing) and the suffix "-ous" (meaning full of or characterized by). The word "slaughterous" means characterized by or full of slaughter, indicating a violent or bloody nature.
Think of the act of killing ('slaughter') and remember that 'slaughterous' describes something that is full of or characterized by that violent act.