* Unassuming: They don't stand out or attract attention.
* Quiet and reserved: They don't speak much and don't draw attention to themselves.
* Not particularly attractive: They are not conventionally beautiful or handsome.
Essentially, it means someone who is so ordinary that you wouldn't even notice them. They are "invisible" in a way, not because they are trying to hide, but because they simply blend in with the background.
Here are some examples of how it's used:
* "Si Juan ay di makabasag tingin, kaya hindi siya napansin ng mga babae." (Juan is unassuming, so the girls didn't notice him.)
* "Ang kanyang damit ay di makabasag tingin, parang pangkaraniwang tao lang." (His clothes are ordinary, just like an average person's.)
* "Kahit na nasa gitna ng maraming tao, siya ay di makabasag tingin." (Even in a crowd, he is unassuming.)
The idiom can have a slightly negative connotation, implying that the person is not interesting or memorable. It can also be used in a humorous way to describe someone who is so ordinary that they are almost comical.