A. barren
B. solid
C. unploughed
D. hard
Fecund : producing or capable of producing an abundance of offspring or new growth; highly fertile.
Barren : (of land) too poor to produce much or any vegetation.
Solid : firm and stable in shape; not liquid or fluid.
Unploughed : (of an area of land) not having been ploughed.
Hard : solid, firm, and rigid; not easily broken, bent, or pierced.
Antonym of Fecund is Barren
