Fastigiated is a word used to describe something that is tall and narrow, such as a tree or a building. However, if you are looking for synonyms for this word, you may consider using words like columnar, erect, spirelike, or turretlike. Other synonyms may include pyramidal, spired, towerlike, or upright. These words all convey a similar meaning to fastigiated, indicating something that is tall, narrow, and often pointed or cone-shaped. By using these synonyms, you can diversify your language and create more vivid descriptions of the world around you.