many vs thin on the ground

many

• Existing in large number; numerous. 

• A considerable number. 

• A multitude; a great aggregate; a mass of people; the generality; the common herd. 

• An indefinite large number of. 

• Used to indicate, demonstrate or compare the number of people or things. 

• An indefinite large number of people or things. 

thin on the ground

• scarce, or difficult to find.