stiff: may apply to any degree of this condition: muscles will become ~ if they are not stretched.


rigid: applies to something SO stiff THAT it can't be bent without breaking: a ~ surfboard.


inflexible: stresses lack of suppleness or pliability: for adequate support, rock-climbers wear shoes with ~ soles. (supple: 物体柔软身体柔韧皮肤弹性supple object,skin,body)


tense: suggests a stretching or straining to the point where elasticity or flexibility is lost: ~ nerves. (elastic: 可拉伸而不断)


wooden: suggests the hard inflexibility and dry rigidity of wood and connotes stiffness and lack of life and often clumsy or heavy deadness: moved in a start ~ manner.


stiff僵硬: 任何程度的难以弄弯(bend使弯曲)， rigid: 僵硬到弄弯就会被折断的程度， inflexible不灵活: 不柔软难拉伸，tense紧张: 拉伸或挤压到无法拉伸挤压的程度， wooden木头般的:  形容像木头般的僵硬死板笨重。


记忆方法: 1）首字母 SIT WR坐着写字: 脖子僵硬


         2）僵硬的意思是难以弯曲mean difficult to bend. (bend使不再直)