1. Too small to be visible to the naked eye

See also: seeable, visible

• moral certainty
• moral excellence
• moral force
• moral hazard
• moral obligation
• moral philosophy
• moral principle
• moral sense
• morale
• morale booster
• morale builder
• morale building
• moralisation
• moralise
• moraliser
• moralising
• moralism
• moralist
• moralistic
• morality
• morality play
• moralization
• moralize
• moralizer
• moralizing