Example : In the 19th century any reference to female sexuality was considered a vile aspersion.
It is difficult for a woman to understand a man's sensitivity to any slur on his virility.

Synonyms : aspersion

Example : He had a smudge on his cheek.

Synonyms : blot, daub, smear, smirch, smudge, spot

Example : The pianist slurred the most beautiful passage in the sonata.

Example : Your comments are slurring your co-workers.

Example : The distinction between the two theories blurred.

Synonyms : blur, dim