Free from foreign matter or pollution; unadulterated: clean air; clean drinking water.
Not infected: a clean wound.
Producing relatively little pollution: a clean fuel; a cleaner, more efficient engine.
Producing relatively little radioactive fallout or contamination: a clean nuclear bomb.
Not ornate or intricate; spare: "the clean lines and exquisite proportions of early modernism"(Judith Thurman).
Sharply defined; clear-cut: a clean outline against the sky.
Morally pure; virtuous: led a clean life.
Having no marks of discredit or offense: a clean voting record.
Not carrying concealed weapons or drugs.
Innocent of a suspected crime.
Free from narcotics addiction.
Showing no evidence of using banned or performance-enhancing substances: proven to be clean before the race.
Producing relatively little pollution: a clean fuel; a cleaner, more efficient engine.
Producing relatively little radioactive fallout or contamination: a clean nuclear bomb.
Not ornate or intricate; spare: "the clean lines and exquisite proportions of early modernism"(Judith Thurman).
Sharply defined; clear-cut: a clean outline against the sky.
Morally pure; virtuous: led a clean life.
Having no marks of discredit or offense: a clean voting record.
Not carrying concealed weapons or drugs.
Innocent of a suspected crime.
Free from narcotics addiction.
Showing no evidence of using banned or performance-enhancing substances: proven to be clean before the race.
Having no imperfections or blemishes; regular or even: a clean edge; a smooth, clean joint.
Not ornate or intricate; spare: "the clean lines and exquisite proportions of early modernism"(Judith Thurman).
Sharply defined; clear-cut: a clean outline against the sky.
Morally pure; virtuous: led a clean life.
Having no marks of discredit or offense: a clean voting record.
Not carrying concealed weapons or drugs.
Innocent of a suspected crime.
Free from narcotics addiction.
Showing no evidence of using banned or performance-enhancing substances: proven to be clean before the race.
Free from clumsiness; deft; adroit: a clean throw.
Devoid of restrictions or encumbrances: a clean bill of health.
Thorough; complete: a clean getaway.
Having few alterations or corrections; legible: clean manuscript.
Blank: a clean page.
Morally pure; virtuous: led a clean life.
Having no marks of discredit or offense: a clean voting record.
Not carrying concealed weapons or drugs.
Innocent of a suspected crime.
Free from narcotics addiction.
Showing no evidence of using banned or performance-enhancing substances: proven to be clean before the race.
Fit for all readers, listeners, or audiences; not ribald or obscene: a clean joke.
Honest or fair: a clean fighter; a clean competition.
Slang
Not carrying concealed weapons or drugs.
Innocent of a suspected crime.
Free from narcotics addiction.
Showing no evidence of using banned or performance-enhancing substances: proven to be clean before the race.
Informal
Free from narcotics addiction.
Showing no evidence of using banned or performance-enhancing substances: proven to be clean before the race.
adv.
cleaner, cleanest
So as to be unsoiled: wash the dishes clean.
In a fair manner: played the game clean.
In a clean or nonpolluting manner: a fuel that burns clean.
Informal Entirely; wholly: clean forgot the appointment.
v.
cleaned, clean·ing, cleans
v.
tr.
To rid of dirt, rubbish, or impurities: clean a room; clean a suit.
To get rid of (impurities or dirt, for example); remove: cleaned up the trash; cleaned off the stains.
To prepare (fowl or other food) for cooking, as by removing the entrails or fat.
To remove the contents from; empty: cleaned my plate.
Sports To lift (a barbell) from the floor to the shoulders in one motion.
v.
intr.
To undergo or perform an act of cleaning.
Phrasal Verbs:
clean out
To rid of dirt, rubbish, or impurities.
To empty of contents or occupants.
Informal To drive or force out: cleaned out the incompetent workers.
Slang To deprive completely of money or material wealth: The robbery cleaned us out.
To make clean or orderly.
To make oneself clean, neat, or presentable.
To dispose of; settle: cleaned up the unpaid bills.
Slang To make a large profit, often in a short period of time: cleaned up during the bull market.
Phrasal Verb(s): clean out
To rid of dirt, rubbish, or impurities.
To empty of contents or occupants.
Informal To drive or force out: cleaned out the incompetent workers.
Slang To deprive completely of money or material wealth: The robbery cleaned us out.
clean up
To make clean or orderly.
To make oneself clean, neat, or presentable.
To dispose of; settle: cleaned up the unpaid bills.
Slang To make a large profit, often in a short period of time: cleaned up during the bull market.
Idiom(s):
clean house Slang To eliminate or discard what is undesirable: The scandal forced the company to clean house.
[Middle English clene, from Old English clǣne.] clean'a·ble adj., clean'ness n.
Synonyms: These adjectives mean free from dirt: clean clothing; antiseptic surgical instruments; a cleanly pet; an immaculate tablecloth; a spotless kitchen.
[klee-nuh-bil-i-tee] 
nəˈbɪl