puissant

puis·sance  (pwsns, py-sns, py-sns)

n.

Power; might.

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[Middle English, from Old French, from poissant, powerful, present participle of pooir, to be able; see power.]

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puissant adj.

puissant·ly adv.

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puissant [ˈpjuːɪs^ənt]

adj

Archaic or poetic powerful

[from Old French, ultimately from Latin potēns mighty, from posse to have power]

puissantly  adv

Thesaurus

Adj.

1.

puissant - powerful archaicism, archaism - the use of an archaic expression powerful - having great power or force or potency or effect; "the most powerful government in western Europe"; "his powerful arms"; "a powerful bomb"; "the horse's powerful kick"; "powerful drugs"; "a powerful argument"