concave

an area with sides higher than the center: an indentation, a depression, a dip, a divot, a hole / (slang) female genitalia, the vagina

a pit, a hollow, a cavity, a depression, a dent

a sunken center / a place or object with a sunken center

a pit, a hollow, a cavity, a depression, a dent / a mistake, and error / a moment of weakness or confusion, being at a loss

an indentation, a dip or divot, a hollow, a dent in a surface

concave / depressed / hollow

concave area