Eyebrows that are hard to see (usually blonde)
You have invisibrows
Eyebrows that are there, but are basically invisible. Some people are born with giant, thick brows, others are born with invisibrows. Whether they're extremely sparse or super blonde, they are unfortunate.
"drawing your eyebrows on is freaky and gross"
"hey man, shut it. I was born with invisibrows. I look like a damned alien if I don't draw them on"