1. Failing or refusing to observe religious customs

See also: irreligious

• Sylvester II
• Sylvia communis
• Sylvia curruca
• Sylvia Plath
• Sylvian aqueduct
• Sylvian fissure
• Sylviidae
• Sylviinae
• Sylvilagus
• Sylvilagus aquaticus
• Sylvilagus floridanus
• Sylvilagus palustris
• sylvine
• sylvite
• Symbion pandora
• symbiont
• symbiosis
• symbiotic
• symbiotically
• symbol
• symbol-worship
• symbolatry
• symbolic
• symbolic logic
• symbolic logician