altamente
/ˌaltaˈmente/ · B2 · adv
highly (extremely)
📈🔝 alta + mente = high + mind/manner → highly, to a high degree
Spanish builds adverbs by adding -mente (like English -ly) to an adjective. Alta means high, so altamente means in a high manner: highly or extremely. Same pattern as rápida → rápidamente.