quadric surface hook bell shape gooseneck sinuosity crenature catenary helix Gaussian curve perversion normal curve line roulette spiral crenelle bow extrados curved shape meander Cupid's bow crook twist S-shape bend quadric crenation envelope sinuousness undulation line arch crotchet crenel wave crescent arc scallop turn campana Gaussian shape closed curve bell intrados roulette bell-shaped curve

regression line regression curve line graphical record graph

blindfolded sightless red-blind tritanopic sand-blind blinded purblind visually challenged blindfold snow-blind colour-blind green-blind unsighted snow-blinded dazzled eyeless near-blind unseeing dim-sighted deuteranopic visually impaired color-blind stone-blind blue-blind protanopic

people blind person

unperceptive unperceiving

peel off turn veer slew cut trend sheer yaw swerve slue

irrational unreasoning

change modify abacinate alter

snow-blind bedazzle seel dazzle daze

concealment screen covert cover