| mystifying(adjective, evil, mysterious, threatening, nefarious) |
| nauseous(adjective, unpleasant, horrible, disagreeable, dreadful) |
| nefarious(adjective, evil, mysterious, threatening, spooky) |
| noisome(adjective, unpleasant, horrible, disagreeable, dreadful) |
| not known(expression, adjective, evil, mysterious, threatening) |
| objectionable(adjective, unpleasant, horrible, disagreeable, dreadful) |
| obnoxious(adjective, rough, nasty, dark, unpleasant) |
| occult(adjective, evil, mysterious, threatening, nefarious) |
| odious(adjective, unpleasant, horrible, disagreeable, dreadful) |
| offensive(adjective, unpleasant, horrible, disagreeable, dreadful) |
| oppressing |
| out of sorts(expression, idiom, sullenness) |
| pesky(adjective, unpleasant, horrible, disagreeable, dreadful) |
| pugnacious(adjective, rough, nasty, dark, unpleasant) |
| puzzling(adjective, evil, mysterious, threatening, nefarious) |
| quarrelsome(adjective, rough, nasty, dark, unpleasant) |
| recondite(adjective, evil, mysterious, threatening, nefarious) |
| redoubtable |
| regrettable |
| relentless(appearance, terrible, hopeless) |