Is there way to use ls cmd to list out all file with specific string in random location of the filename?

I can’t find any way to list out files with specific string in random location of the filename, except “find” command.

I don’t want to use find command, it is very complicated to me.

for example:
I want to list out files with “def” inside the filename no matter where the specified string is located.
aa234aaaaaaaaadefaaaaa42.txt
defaaaaaaaa234.txt
aaaa234aadef.txt

Is there way to achieve this with our common “$ls” command ?

Thx