The word "is startled" refers to the sudden feeling of surprise or shock caused by a sudden incident or noise. There are various synonyms that one can use to describe the same feeling effectively. Some of the synonyms for the word "is startled" include frightened, alarmed, jolted, surprised, shocked, taken aback, astounded, amazed, and flabbergasted. Each of these words can be utilized correctly in different contexts to add more meaning and depth to the intended message. In summary, understanding the right synonyms for the word "is startled" can make your writing more expressive and exciting to read, revealing the full range of emotions the characters in your writing are experiencing.