Someone who's bloodthirsty is savage and murderous, or is very quick to resort to violence. A bloodthirsty general might launch one attack after another, eager to kill as many enemy soldiers as possible.

A bloodthirsty government is one that enthusiastically wages war with other countries and might even be casual about violently suppressing its own citizens. You can also describe a book or a movie this way, if it's full of gratuitous, gory scenes: "What a bloodthirsty zombie film that was last night." The word has been around since the 16th century, possibly influenced by a word with similar imagery in Greek, haimodipsos.

Definitions of bloodthirsty
  1. adjective
    marked by eagerness to resort to violence and bloodshed
    bloodthirsty yells”
    synonyms: bloody-minded, sanguinary
    having or covered with or accompanied by blood
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