inanimate
solid, three-dimensional
large, small
heavy, sharp, etc.
egg-shaped, V-shaped, etc.
man-made
common, everyday, familiar, household
Her paintings are of ordinary everyday objects.

decorative
flying, moving
stationary
distant
material, physical
sacred
foreign
people who claim to have found foreign objects in cans

sex, sexual
He regards women as nothing more than sexual objects.

main, primary, principal
sole
My sole object is to get to the bottom of this mystery.

lesson
The plans are an object lesson in how to ruin a city.

the object of the exercise (esp. BrE), the object of the game
The object of the game is to score as many points as possible.
It would defeat the object of the exercise if we paid someone to do it for us.