frighten, fright, scare, affright -- (cause fear in; "The stranger who hangs around the building frightens me"; "Ghosts could never affright her")
frighten -- (drive out by frightening)
Overview of adj frightening
The adj frightening has 1 sense
awful, dire, direful, dread, dreaded, dreadful, fearful, fearsome, frightening, horrendous, horrific, terrible -- (causing fear or dread or terror; "the awful war"; "an awful risk"; "dire news"; "a career or vengeance so direful that London was shocked"; "the dread presence of the headmaster"; "polio is no longer the dreaded disease it once was"; "a dreadful storm"; "a fearful howling"; "horrendous explosions shook the city"; "a terrible curse")