If you don’t know anything about a person or a thing, or if something is unfamiliar to you, it might seem strange. We also use the word "strange" for things that are scary or cause concern.
This is a strange object. What is it?
There’s a strange smell coming from the engine.
This meat has a strange taste. Is it okay?
Maria had a very strange day today.
Edgar saw something very strange while riding on the subway.
There’s a strange guy in Hector’s class. He doesn’t say very much, and he smells really bad.
The sky looks very strange. Is a storm coming?
My stomach feels strange. I think I might be sick.
The word "strangely" is an adverb. Use it to modify a verb:
He’s acting strangely. (The adverb "strangely" modifies the verb.)
The host of the party was acting strangely towards her guests.
My car is behaving strangely.
The word "stranger" is a noun. Use this word for a person:
A stranger in our neighborhood was looking through the trash.
Parents always tell their kids to be careful around strangers.
After the divorce, David now feels like a stranger when he goes to his old house to visit his kids.