infertile /in-fûrˈtīl or (US) -til/

1. Not fertile
2. Not capable of producing offspring, sterile
3. Not productive
4. Barren

• unimaginative
• unimaginatively
• unimaginativeness
• unimagined
• unimbued
• unimmortal
• unimolecular
• unimpaired
• unimparted
• unimpassioned
• unimpeachable
• unimpeached
• unimpeded
• unimpededly
• unimplored
• unimportance
• unimportances
• unimportant
• unimportuned
• unimposed
• unimposing
• unimpregnated
• unimpressed
• unimpressible
• unimpressionable