一个

singleton; single; one; an

老太太

old lady; elderly woman; grandma; granny; matriarch; old dame

恐怖

terrifying; dreadful; horrific; fearsome; scary; frightful; ghastly; gruesome; horrendous; terrorizing; appalling; hideous; shocking; chilling; grim; dire; eerie; monstrous; terror; horror; dread; fright; fear; terrorism