What does cleanliness mean?
Cleanliness is an uncountable noun describing the state of being free from dirt, stains, germs, or any unwanted matter, and by extension the habit of keeping oneself and one's surroundings clean. It applies equally to physical spaces, such as the spotlessness of a hospital ward, and to personal habits, where it overlaps closely with hygiene. The word carries consistently positive connotations — order, care, professionalism, and health — and is a staple of everyday speech in contexts ranging from hotel reviews to public-health guidelines, as in 'standards of cleanliness' or 'personal cleanliness'. English speakers have long treated cleanliness as a moral as well as practical virtue, reflected in the familiar proverb 'cleanliness is next to godliness'. Its antonyms include dirtiness and filthiness. Because it names both a condition and a practice, cleanliness remains one of the most versatile and culturally loaded words for talking about how we care for our bodies and environments.
The state or quality of being clean; freedom from dirt, stains, or unwanted matter.
"Guests repeatedly complimented the hotel on the cleanliness of its rooms."
The habitual practice or personal virtue of keeping oneself and one's environment clean; attention to hygiene.
"Good cleanliness, doctors advise, is one of the simplest defenses against infection."
In this sense the word often appears in health education and regulatory guidance, and overlaps with 'hygiene'.
The proverb 'cleanliness is next to godliness' is usually credited to John Wesley in the 1700s — but the idea of washing as a moral act goes back to ancient ritual purity laws.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cleanliness
Cleanliness derives from the adjective 'clean', which comes from Old English clǣne, meaning free from dirt or impurity, of Germanic origin. The suffix '-ness' was added in Middle English to form the abstract noun denoting the quality of being clean. It is thus related to words such as 'cleanse' and 'cleanly', all tracing back to the same Germanic root. The extended sense linking cleanliness to moral or spiritual purity developed over centuries and was popularized by religious writers, notably John Wesley in the eighteenth century.
Related word forms
How cleanliness is actually used
Cleanliness is an uncountable noun and has no plural. It carries broadly positive connotations and appears frequently in health, hospitality, and regulatory contexts (e.g., inspections, ratings). It can refer both to a physical state ('the cleanliness of the room') and to a personal virtue or habit ('a fastidious regard for cleanliness').
Easily confused with cleanliness
Cleanness is a rarer, more formal noun meaning simply the state of being clean, while cleanliness refers more broadly to the habit or quality of keeping things clean.