Straightness
Nouns
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straightness, rectilinearity, directness
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inflexibility etc. (stiffness) Hardness
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straight line, right line, direct line
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short cut.
Verbs
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be straight etc. adj.
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have no turning
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not incline to either side, not bend to either side, not turn to either side, not deviate to either side
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go straight
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steer for etc. (directions) Direction. render straight, straighten, rectify
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set straight, put straight
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unbend, unfold, uncurl etc. [Complex curvature.] Convolution, unravel etc. Crossing, unwrap.
Adjectives
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straight
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rectilinear, rectilineal
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direct, even, right, true, in a line
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unbent, virgate etc. v.
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undeviating, unturned, undistorted, unswerving
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straight as an arrow etc. (direct) Direction
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inflexible etc. Hardness. laser-straight
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ramrod-straight.