Final answer:
The word 'restrained' means controlled, not excessive, and characterized by formality and simplicity, as suggested by phrases relating to balance and symmetry in the text. The Classical Period and Neoclassical art movements corroborate this sense of restraint with their emphasis on order and simplicity.
Step-by-step explanation:
Based on the context clues in the text, the word restrained refers to something that is controlled, not excessive or overdone, and characteristically formal and simple. The words and phrases that help determine this meaning include 'perfectly balanced and symmetrical,' 'hardly adorned,' 'not include excess features,' 'balance and order,' and 'follow Aristotle's unities.' These phrases depict restraint as an intentional limitation to achieve a specific, balanced aesthetic. A dictionary confirms that 'restrained' means holding back, controlled or kept within limits. This would be in line with the classical revival or Neoclassicism, which emphasized order, symmetry, and simplicity.
The Classical Period in Greek culture, referred to by LibreTexts™, is recognized for its influence on art and architecture with a formal and restrained style. An example of restrained sculpture is the 'Severe Style,' which transitioned from the Archaic to more idealized forms. Additionally, Neoclassicism during the Enlightenment and the features of classicism further corroborate the restrained nature of the art from these periods, drawing from harmony, proportion, balance, and simplicity.