strong or vigorous

fortified or reinforced

किलेबंद

English Usage: The fortis walls of the castle were impenetrable.

Hindi Usage: महल की किलेबंद दीवारें अभेद्य थीं।

strengthened or brave

मजबूत

English Usage: She displayed a fortis spirit during the competition.

Hindi Usage: उसने प्रतियोगिता के दौरान एक मजबूत आत्मा दिखाई।