1Giving the impression that something is being hidden or not to be trusted; suspicious-looking.
深夜に一人でうろついている人がいて、なんだか怪しい。
There's someone wandering around alone late at night - it feels suspicious.
このメールのリンクは怪しいから、絶対にクリックしないで。
The link in this email is suspicious, so don't click it.
彼の説明はどこか怪しくて、すぐには信じられなかった。
There was something fishy about his explanation, so I couldn't believe it right away.
怪しい訪問販売には気をつけたほうがいい。
You should be careful of dubious door-to-door salespeople.
2Something seems unlikely to happen or be true; doubtful.
明日までに仕上がるかどうか怪しいものだ。
It's doubtful whether it'll be finished by tomorrow.
彼が約束を守るかどうかは怪しい。
It's questionable whether he'll keep his promise.
この天気だと、花見に行けるかどうか怪しい。
With weather like this, it's doubtful we'll be able to go see the cherry blossoms.
3Of poor or unreliable quality, skill, or craftsmanship; shaky.
彼の英語の発音はまだ怪しい。
His English pronunciation is still pretty shaky.
その足場は怪しいから、上に乗らないほうがいい。
That scaffolding looks unstable, so you shouldn't climb on it.
4Giving an odd, eerie, or spooky impression, unlike the ordinary.
夜の墓地から怪しい物音が聞こえた。
A strange sound could be heard from the graveyard at night.
古い屋敷には何か怪しい雰囲気が漂っていた。
The old mansion had a somewhat eerie atmosphere about it.
空に怪しい光が現れたと騒ぎになった。
There was a commotion when a strange light appeared in the sky.
5Ominous or threatening, especially of weather or a financial situation heading in a bad direction.
雲行きが怪しくなってきたので、傘を持って行こう。
The sky is starting to look ominous, so let's bring an umbrella.
会社の経営が怪しいという噂が広がっている。
Rumors are spreading that the company's finances are shaky.
6Suspecting that a partner or spouse may be having an affair, based on their behavior.
最近夫の帰りが遅く、なんだか怪しい。
My husband's been coming home late lately, and it seems suspicious.
スマホを隠すようになった彼氏の様子が怪しい。
My boyfriend started hiding his phone, and it's suspicious behavior.
7Mysterious and captivating, with an otherworldly, bewitching charm (also written 妖しい).
月明かりの下で、彼女は怪しい美しさを放っていた。
Under the moonlight, she radiated a mysteriously alluring beauty.
その踊り子の怪しい魅力に、観客はみな引き込まれた。
The audience was all drawn in by the dancer's bewitching charm.