The storm approached frighteningly fast, leaving everyone scrambling for shelter.

The old mansion at the end of the lane looked frightfully eerie under the moonlight.

The sudden blackout during the movie managed to frighten the piss out of everyone in the theater.

The normally calm horse proved frightenable when the thunderstorm began, bolting from the paddock.

The old crone's whisper frighteneth the children more than any tale of goblins.

Thou frightenest the children with ghost stories by candlelight.

She stepped back frightenedly when the dog barked suddenly.

Her frightenedness was evident when she stepped into the dark, empty house.

Even in a crowded room, he behaved like a frightened rabbit, avoiding eye contact and shrinking back from conversation.

I didn't want to be rude, but that dress made her look like a frightmare.