THESAURUS
unbent
arrowlike, dead straight, direct, even, flat, horizontal, in a line, level, lineal, linear, rectilineal, rectilinear, right, ruler-straight, smooth, straight, straight-cut, straight-front, straight-side, streamlined, true, unbending, unbowed, unbroken, uncurved, undeflected, undeviating, undistorted, uninterrupted, unswerving, unturned, upright, vertical
ROGET THESAURUS
unbent
Straightness
N
straightness, rectilinearity, directness, inflexibility, straight line, right line, direct line, short cut, straight, rectilinear, rectilineal, direct, even, right, true, in a line,
unbent, virgate, undeviating, unturned, undistorted, unswerving, straight as an arrow, inflexible, laser-straight, ramrod-straight.