faintness  
noun [ U ] uk/ˈfeɪnt.nəs/ us/ˈfeɪnt.nəs/
  (NOT CLEAR)      
  微弱;模糊
the quality of not being strong or clear
  The faintness of the handwriting made the manuscript difficult to read. 字迹模糊使手稿难于阅读。 
   (WEAK FEELING)      
 头昏,眩晕;近乎昏厥
the feeling that you are about to become unconscious
  Faintness and morning sickness can be signs that you are pregnant. 头昏和晨吐都可能是怀孕的征兆。