1. In an imperceptible manner or to an imperceptible degree
   - imperceptibly

See also: unnoticeable

• American cranberry
• American cranberry bush
• American crayfish
• American creeper
• American cress
• American crow
• American dewberry
• American dog tick
• American dog violet
• American dogwood
• American Dream
• American dwarf birch
• American eagle
• American egret
• American elder
• American elk
• American elm
• American English
• American Falls
• American featherfoil
• American Federalist Party
• American Federation of Labor
• American Federation of Labor and Congress of Industrial Organizations
• American feverfew
• American flag