what; what sort of thing
Used to ask what someone is referring to, often when the speaker doesn't understand the topic or wants clarification. Common in questions like 何のことですか？
"How did that matter turn out?" "What are you talking about?"
something unusual; something out of the ordinary
Used in negative or questioning contexts to indicate that nothing special or unusual is happening. Often appears as 何のこともない or 何のことなく.
what the heck; holy cow
Exclamatory use expressing surprise, disbelief, or frustration. Often used as a standalone interjection.
What the heck! Late again?
The whole day passed without anything unusual happening.
Standard kanji-kana mixed spelling.
Variant with 事 instead of こと; less common but still seen.
Phrase composed of 何 (what) + の (possessive particle) + こと (thing/matter). The combination is straightforward and has been used in Japanese for centuries.