Unfrightening, a word that means something that is not scary, can have numerous antonyms. Some of the antonyms for unfrightening are terrifying, frightening, alarming, horrifying, spooky, eerie, creepy, and hair-raising. These words are used to describe situations or objects that invoke fear or anxiety in a person's mind. The world is full of unfrightening and frightening objects, and the use of the antonyms for unfrightening helps to differentiate between what is and is not scary. Choosing an antonym for unfrightening will certainly depend on the level of fear a person feels, the context of the situation, and the location of the object in question.