frictionless

Adjective

• lacking all friction
  • "a perpetual motion machine would have to be frictionless"

Adj

• Of or pertaining to lack of friction.
• Of a transaction or trade, without tariffs and non-tariff barriers.

Examples

• A hard border is a real possibility, and a frictionless border is almost an oxymoron.
• It would last many years because of its frictionless bearings.