This is the 8394th most frequent Japanese word.
怪し
"怪し" (ayashi) means "suspicious," "doubtful," or "strange" in English.
Here, '怪しい' is used to describe something that seems untrustworthy or doubtful, suggesting suspicion about the prices.
その店の価格は少し怪しいと思います。
I think the prices at that store are a bit suspicious.
In this case, '怪しい' conveys a sense of mystery or strangeness regarding the light.
夜空に怪しい光が見えた。
I saw a mysterious light in the night sky.
'怪しい' here implies that the person's actions sometimes seem questionable or dubious in nature.