unobtrusive (adj.)

• aesthetic
• artistic
• backstairs
• chaste
• choice
• clandestine
• classic
• covert
• excellent
• feline
• furtive
• hole-and-corner
• hugger-mugger
• humble
• meek
• modest
• pleasing
• privy
• pure
• quiet
• restrained
• shifty
• simple
• sly
• sneaking
• sneaky
• stealthy
• subdued
• surreptitious
• tasteful
• tasty
• unaffected
• unambitious
• unassuming
• under-the-counter
• under-the-table
• undercover
• underground
• underhand
• underhanded
• understated
• unimposing
• unostentatious
• unpretending
• unpretentious
• well-chosen