1. Having lewd thoughts

See also: dirty

• natural enclosure
• natural endowment
• natural event
• natural family planning
• natural fiber
• natural fibre
• natural gas
• natural glass
• natural history
• natural immunity
• natural language
• natural language processing
• natural language processing application
• natural language processor
• natural law
• natural logarithm
• natural number
• natural object
• natural order
• natural phenomenon
• natural philosophy
• natural process
• natural resin
• natural resource
• natural resources