Roget's Thesaurus of English Words and Phrases by Peter Mark Roget

246. Straightness — N. straightness, rectilinearity†, directness;

inflexibility &c (stiffness) 323; straight line, right line, direct line; short cut. V. be straight &c adj.; have no turning; not incline to either side, not bend to either side, not turn to either side, not deviate to either side; go straight; steer for &c (directions) 278. render straight, straighten, rectify; set straight, put straight; unbend, unfold, uncurl &c 248, unravel &c 219, unwrap. Adj. straight; rectilinear, rectilineal†; direct, even, right, true, in a line; unbent, virgate† &c v.; undeviating, unturned, undistorted, unswerving; straight as an arrow &c (direct) 278; inflexible &c 323. laser-straight; ramrod-straight.