Four-square is an adjective that can be used to describe something or someone that is solid, strong, or reliable. It can also refer to a game played with a ball, typically in a square shaped court. Synonyms for four-square include: steadfast, sturdy, firm, dependable, unyielding, resolute, unwavering, robust, square and stable. All these words describe something that is reliable, trustworthy and secure. In terms of the game, synonyms for four-square includes: boxball, handball, squareball, king of the square and champ. These words signify the fun and excitement that comes with playing the four-square game. Overall, the word four-square and its synonyms represent positivity and strength.