Frightening
Frighten
eerie
scary or eerie
Horrendous Love?
One close rhyme is the word "merry" (fun). Another possibility is the word "airy" (light, pleasant).
Horrible, scary, disgusting,ugly..
Creepy, scary, unnerving, spooky.
scary, horrifying and/or frightening
eerie, frightening, morbid, hair-raising
Yes. E.g. The scary lockdown at my school happened two months ago.
Satan is a scary leviathan. Enormous Leviathan is another phrase.
Scary, frightening, alarming, unsettling, disquieting, disturbing, freaky, ghostly, nightmarish