What is most important word in sonnet 61 by francesco petrarch?

In Sonnet 61, one of the most important Words is "solitude." This term encapsulates the speaker's deep sense of isolation and longing for the beloved, reflecting the emotional turmoil of unrequited love. The use of solitude highlights the internal struggle and yearning that permeates the poem, emphasizing the profound impact of love on the speaker's psyche. Ultimately, it conveys the theme of love as both a source of joy and deep sorrow.