This is the 4001st most frequent Swedish word.
mäktigaste
"Most powerful."
Here, 'mäktigaste' is used as a superlative adjective meaning 'the most powerful', modified by 'den' indicating a specific entity.
Kungen är den mäktigaste i landet.
The king is the most powerful in the country.
In this sentence, 'mäktigaste' describes the quality of the singing voice, emphasizing its unmatched magnitude or power.
Hon har den mäktigaste sångrösten jag någonsin har hört.
She has the mightiest singing voice I have ever heard.
Here, 'mäktigaste' contrasts the degree of intensity or power among storms, denoting the ones with the highest capacity.