Infertile (6)
'infertile' is the definition.
(synonyms)
This is all the clue.
(Other definitions for barren that I've seen before include "Unable to reproduce, infertile" , "Infertile, unproductive" , "Unable to bear fruit, not fertile" , "Sterile" , "Arid, infertile" .)
'infertile' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for sterile that I've seen before include "Not able to produce offspring" , "Incapable of reproducing" , "Not producing offspring" , "Unproductive" , "Antiseptic" .)