1. State or quality of being simple; artlessness; weakness of intellect.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• amplenesss,
• ampleness,
• impreness,
• aimpleness,
• zimpleness,
• ximpleness,
• dimpleness,
• eimpleness,
• wimpleness,
• sumpleness,
• sjmpleness,
• skmpleness,
• sompleness,
• s9mpleness,
• s8mpleness,
• sinpleness,
• sikpleness,
• simpleeness,
• swolleness,
• simpliseness

• simple-minded,
• simple pistil,
• simple eye,
• samples,
• sinfulness,
• simpleton,
• simplex,
• Simpler,
• simple sugar.

The adjective form of the word "simpleness" is "simple".

The plural of the "simpleness" can be the "simplenesses".

The singular of the "simpleness" can be the "simpleness".