Breakdown of Questa soluzione è decisamente migliore.
Questions & Answers about Questa soluzione è decisamente migliore.
Because soluzione is a feminine singular noun, and the demonstrative adjective has to agree with it.
- questo = this (masculine singular)
- questa = this (feminine singular)
So:
- questo libro = this book
- questa soluzione = this solution
Italian agreement is very important: articles, adjectives, and demonstratives usually match the noun in gender and number.
In Italian, nouns have grammatical gender, and soluzione is simply one of the nouns that are feminine.
A helpful clue is its ending:
- many nouns ending in -zione are feminine
- la nazione
- la stazione
- la soluzione
So you say:
Even though solution in English has no grammatical gender, in Italian it does.