probing (into); digging (into); prying (into); scrutiny; poking one's nose into; poking around
他人の私生活を穿鑿するのは無作法だ。
It is rude to pry into other people's private lives.
過度な穿鑿が人間関係を壊すことがある。
Excessive prying can destroy human relationships.
真相を穿鑿するために調査が行われた。
An investigation was conducted to probe into the truth.