1. （头发）乱成一团的,乱蓬蓬的,缠结在一起的
If you describe someone's hair as matted, you mean that it has become a thick untidy mass, often because it is wet or dirty.

1. tangled in a dense mass

e.g. tried to push through the matted undergrowth

2. not reflecting light
not glossy

e.g. flat wall paint
a photograph with a matte finish

Synonym: flatmatmattmatte