IPA: /ˈblʌdˌθɜːr.stɪ.li/
KK: /ˈblʌdˌθɜrsti li/
In a way that shows a strong desire to kill or cause harm to others.
The villain laughed bloodthirstily as he plotted his revenge.
Bloodthirstily → It is formed from "blood" (from Old English "blōd", meaning the red liquid that circulates in the bodies of humans and animals) and "thirstily" (from "thirsty" which comes from Old English "þirstig", meaning having a strong desire for something). The word "bloodthirstily" describes a manner of having a strong desire for blood or violence, often associated with a savage or cruel intent.
Think of the strong desire for 'blood' and the intense craving implied by 'thirstily' — this helps you remember that 'bloodthirstily' means acting with a savage desire for blood.
No commonly confused words.