1. Without force or sincere effort
   "smiled thinly" 
2. Without viscosity
   - thin 
3. In a small quantity or extent
   "spread the margarine thinly over the meat"
   - lightly 
4. In a widely distributed manner
   "thinly overgrown mountainside"

See also: thin

Antonym: thickly

• unearned increment
• unearned revenue
• unearned run
• unearth
• unearthly
• unease
• uneasily
• uneasiness
• uneasy
• uneatable
• uneaten
• uneconomic
• uneconomical
• unedifying
• unedited
• uneducated
• uneducated person
• uneffective
• unelaborate
• unelaborated
• unembarrassed
• unembellished
• unembodied
• unemotional
• unemotional person