In obsolete terms the difference between single and marred
is that
single is simple; foolish; weak; silly while
marred is of a person, to be perplexed or troubled.
As adjectives the difference between single and marred
is that
single is not accompanied by anything else; one in number while
marred is of a person, to be perplexed or troubled.
As verbs the difference between single and marred
is that
single is to identify or select one member of a group from the others; generally used with out, either to
single out or to
single (something)
out while
marred is past tense of mar.
As a noun single
is a 45 RPM vinyl record with one song on side A and one on side B.