The growth of your eyebrows can be inhibited for many reasons. Overplucking can permanently damage the delicate hair roots and cause eyebrow hair loss. Unpleasant holes in the arch of the eyebrows can become visible. Repeated application of permanent makeup can result in unsightly scars. Hair does not grow back where there is scar tissue.
The density of hair growth can be impaired by injuries or certain medical conditions.
Alternatively, your weak eyebrow growth might be a genetic issue. Skin infections or chemotherapy can also lead to the loss of eyebrows.
If your eyebrows are not growing enough, and this has a negative effect on your self-confidence, you should seriously consider an eyebrow transplant.