linear (adj.)
- consecutive
- direct
- even
- flat
- horizontal
- level
- lineal
- ordinal
- progressive
- rectilineal
- rectilinear
- right
- sequent
- sequential
- serial
- smooth
- straight
- streamlined
- successive
- true
- unbending
- unbent
- unbowed
- unbroken
- uncurved
- undeviating
- undistorted
- uninterrupted
- unswerving
- unturned
- upright
- vertical
