Castor oil
This is an old remedy to thicken eyebrows. You can find castor oil easily in many stores. This inexpensive remedy is easy to use, put some castor oil on your fingers and apply it to your eyebrows before going to bed, wash it off in the morning. You will see changes in 3-4 weeks.
Vaseline, or petroleum jelly, is effective for making your eyebrows bold and thick. It conditions and moisturizes them so well that your eyebrow hair remains straight and firm. Apply a small portion to your eyebrows 3-4 times a day and you will see positive results within 3 months.
Coconut Oil
To get full bold eyebrows you can use coconut oil. It helps speed up the process of hair growth and promotes growth of thick hair. Apply it directly to your brows and leave it overnight.
Onion Juice
Try applying fresh onion juice on your brows to stimulate growth of new hair. Onions contain a high amount of sulfur which helps increase circulation. Apply the juice and leave it pn for an hour then wash off with water.