streamlined (adj.)
- advanced
- aerodynamic
- automated
- avant-garde
- compact
- contemporary
- curved
- curvilinear
- direct
- efficient
- even
- fashionable
- flat
- flowing
- forward-looking
- horizontal
- hydrodynamic
- in
- level
- lineal
- linear
- mod
- modern
- modernistic
- modernized
- modish
- present-day
- productive
- profitable
- progressive
- rectilineal
- rectilinear
- right
- smooth
- straight
- true
- ultramodern
- unbending
- unbent
- unbowed
- unbroken
- uncurved
- undeviating
- undistorted
- uninterrupted
- unswerving
- unturned
- up-to-date
- up-to-the-minute
- upright
- vertical