1. The state of being one only; simplicity; sincerity.

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

• aingleness,
• zingleness,
• xingleness,
• dingleness,
• eingleness,
• wingleness,
• sungleness,
• sjngleness,
• skngleness,
• songleness,
• singlenesss,
• singlness,
• singelness,
• siingleness,
• singlenness,
• sinlesness,
• sinceerness,
• Singenesia,
• gingrliness,
• singulaness

• single tax,
• singhalese,
• shingles,
• shingle,
• single bed,
• single file,
• singleton,
• single stitch,
• singles,
• single shell,
• single entry,
• single out,
• single cream,
• Swingle,
• single quote,
• Singelton,
• singletary,
• singlestick,
• singler,
• single-spaced,
• single-handed,
• single-lane,
• singley,
• singalong,
• single-minded,
• singlet,
• singultus.

The adjective form of the word "singleness" is "single".

The plural of the "singleness" can be the "singlenesses".

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