Final answer:
The adjectives in the sentence are 'content' and 'large', which describe the emotional state of the fish and the size of the aquarium, respectively.
Step-by-step explanation:
In the sentence "Although the fish seemed content in the large aquarium, I still felt sad about keeping them inside," the adjectives are content and large. An adjective is a word that modifies or describes a noun, providing more information about an object's size, shape, age, color, origin, or material.
It's important to balance the sentence with adjectives that give strength and clarity without making the sentence wordy or over-descriptive. For instance, 'content' conveys the emotional state of the fish, and 'large' describes the size of the aquarium. Both adjectives are spaced well apart, each clarifying a different noun, thereby adding valuable detail.