Third-person singular simple present indicative form of frighten.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "frightens" in a sentence
"What is it, Millie, that you are turning over in your mind, which makes you look so desperately sad and fearful, and again -- and then your expression frightens me -- so determined as if you were meditating some step, which, I fear, you ought not to take?"
"In France the authority of that journal is indeed supreme; but its very title frightens the general public, and its blue cover is but seldom seen on the tables of the _salles de lecture_."