Become a dinosaur
Wavy is correct.
My guess is that when the baby starts clawing at your insides, that you will become aware of the existence of its fingernails.
If you are referring to wavy hair, or a wavy line, it is "ondulé/-e."
Yes, fingernails are distal to the wrist. The wrist is considered proximal to the fingernails.
As undulate means to rise and fall, become wavy or rippled, an antonym would be to "roughen".
Wavy.
a wavy rectangle
Wavy in Spanish is ONDULADO which means curly
She has wavy hair. The wavy pattern of that wallpaper is making me feel ill.
penta-fingernails
A curve that is wavy. Like a potato.