The phrase "slim headlights" refers to headlights that are thin or narrow in shape.
Sentences with «slim headlights»
The grille is much larger than before and is partnered with slim headlights, which together give it a more distinctive and confident appearance. (carbuyer.co.uk)
The front end gets slim headlights and a more vertical grille that's mounted lower than on the outgoing model. (autoexpress.co.uk)
In its place is a narrower grille flanked by slim headlights on most models. (kbb.com)