1. Quality or state of being religious.

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

• relgiousness,
• religousness,
• religiousnes,
• irreligiosness,
• irreligiousness,
• prefidiousness,
• presigiousness,
• presitgiousness,
• eeligiousness,
• feligiousness,
• teligiousness,
• 5eligiousness,
• 4eligiousness,
• rwligiousness,
• seditiousness,
• religousnes,
• religousnese,
• religousnesse,
• religousneses,
• relgiousnes

• religious music,
• religiosity,
• religious trance,
• religiously,
• religious right,
• religiousism,
• religious person,
• religious text,
• religious leader,
• religious cult,
• religious song,
• religious rite,
• religious ritual,
• religious belief,
• religious sect,
• religious school,
• religious mystic,
• religious order.

The adjective form of the word "religiousness" is "religious".

The plural of the "religiousness" can be the "religiousnesses".

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