忌まわしい|いまわしいimawashii[4]nakadaka (mid-high)

1. i-adjectiveabhorrent; abominable; detestable; disgusting; horrid; repugnant
   考かんがえるだけでも忌いまわしい。↗

   The very thought is abhorrent to me.
2. i-adjectiveominous; inauspicious; unlucky

• Synonym憎らしいにくらしいNeutralHateful or annoying, mostly of people and what they say or do; can also be ironic for 'adorable'. No ill-omen sense.
• SynonymいやらしいCasualColloquial word for something nasty or off-putting, also lewd or smutty; it lacks the ominous feel of 「忌まわしい」.
• Synonym憎いにくいNeutralHateful, focused on hating a person; can also be ironic, praising someone's impressive skill. No ominous sense.
• Synonym厭わしいいとわしいWrittenWritten-style word for something detestable you want to keep at a distance; unlike 「忌まわしい」 it carries no sense of ill omen.
• Synonym憎々しいにくにくしいNeutralHateful and loathsome, said of someone's hateful words or behaviour; lacks the ominous tinge of 「忌まわしい」.
• Related不愉快ふゆかいNeutralThe plainest word for something unpleasant or upsetting; far milder than 「忌まわしい」 and with no ominous overtone.
• Related不快ふかいNeutralDispleasure or discomfort, and can also mean feeling unwell; mild, used of mood or body, never ominous.
• Related不吉ふきつNeutralInauspicious, stressing a bad omen alone; it carries none of the loathing that 「忌まわしい」 combines with its ominous sense.
• RelatedうっとうしいNeutralGloomy, depressing or irritating — said of weather, moods, or tiresome people and things; quite different from loathing a memory or sensing doom.
• Related疎ましいうとましいWrittenWritten word for someone you instinctively shrink from; stresses psychological rejection, mostly of people, while 「忌まわしい」 also feels ominous.
• Related禍々しいまがまがしいNeutralSinister and eerie, stressing an ill omen that makes your skin crawl; the closest match to the ominous side of 「忌まわしい」.
• Related不祥ふしょうWrittenWritten Sino-Japanese word for inauspicious things, also disgraceful ones as in 「不祥事」; suggests bad omens or scandal, with weaker loathing than 「忌まわしい」.
• RelatedえげつないCasualColloquial, Kansai-flavoured word for crude, ruthless or blatant behaviour; it targets off-putting methods, never ominous events.
• RelatedよからぬNeutralAttributive-only word for something improper or wicked, as in 「良からぬ噂」; its disapproval is milder than the loathing of 「忌まわしい」.
• Related縁起の悪いえんぎのわるいNeutralSet phrase for bad luck or a bad omen; it matches only the ominous side of 「忌まわしい」, with no sense of abhorrence.
• AntonymめでたいNeutralAuspicious and joyous — the happy opposite of 「忌まわしい」 on the lucky–unlucky scale.

「忌まわしい」 covers both loathing and ill omen, as in 「忌まわしい記憶」 and 「忌まわしい事件」. When only a bad omen is meant, use 「不吉」 or 「禍々しい」; for everyday unpleasantness, 「嫌らしい」 or 「不愉快」; the others match only part of its range.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 忌いみたいと思おもわせる様子ようすだ。嫌いやな感かんじを起おこさせる様子ようすだ。
2. 凶兆きょうちょうが現あらわれている。災厄さいやくが起おこりそうな様子ようすだ。