seríssimo
Seríssimo is a Portuguese word that translates to "very serious" or "extremely serious" in English. It is an intensifier, meaning it adds emphasis to the adjective "sério" (serious). The word is formed by combining "ser" (to be) or "sério" (serious) with the superlative suffix "-íssimo," which indicates a very high degree.
In common usage, seríssimo conveys a strong sense of gravity or importance. It might be used to