What is the greek word in English for fierce?

There isn't a single Greek word that perfectly translates to "fierce" in English. However, depending on the specific nuance you want to convey, there are several options:

For general fierceness:

* ἄγριος (agrios): This word signifies wild, savage, or untamed. It captures a sense of untamed strength and ferocity.

* θυμωδής (thymodēs): This word means "full of anger" or "passionate". It can also be used to describe someone who is fierce or aggressive.

* ἀγροίκος (agroikos): This word refers to someone who is rustic, uncouth, or rough. It can also imply fierceness or toughness.

For fierceness in battle or competition:

* ἀνδρεῖος (andreios): This means "brave" or "courageous" and can also convey a sense of fierce determination.

* μαχητής (machētēs): This word literally means "fighter" and implies a fierce spirit in battle.

* ἀκμάζων (akmazōn): This describes someone who is at their peak, strong, and powerful, which can imply fierceness.

For fierceness in a more metaphorical sense:

* ὀξύς (oxys): This word means "sharp" or "keen" and can also convey a sense of intensity or fierceness in a metaphorical way.

* δριμύς (drimys): This means "sharp" or "biting" and can be used to describe something that is fierce or intense in its effect.

Ultimately, the best Greek word for "fierce" depends on the context and the specific nuance you wish to convey.