1. In an imperceptible manner or to an imperceptible degree
   "the power of the Secretary of State in London increased gradually but imperceptibly"
   - unnoticeably

See also: imperceptible

Antonym: perceptibly

• kilocalorie
• kilocycle
• kilocycle per second
• kilogram
• kilogram calorie
• kilogram-meter
• kilogram-metre
• kilogramme
• kilohertz
• kilojoule
• kiloliter
• kilolitre
• kilometer
• kilometers per hour
• kilometre
• kilometres per hour
• kiloton
• kilovolt
• kilovolt-ampere
• kilowatt
• kilowatt hour
• Kilroy
• kilt
• kilted
• kilted up