Source : Webster's Revised Unabridged Dictionary (1913)

Sin \Sin\, v. i. [imp. & p. p. {Sinned}; p. pr. & vb. n.
   {Sinning}.] [OE. sinnen, singen, sinegen, AS. syngian. See
   {Sin}, n.]
   1. To depart voluntarily from the path of duty prescribed by
      God to man; to violate the divine law in any particular,
      by actual transgression or by the neglect or nonobservance
      of its injunctions; to violate any known rule of duty; --
      often followed by against.

            Against thee, thee only, have I sinned. --Ps. li. 4.

            All have sinned, and come short of the glory of God.
                                                  --Rom. iii.
                                                  23.

   2. To violate human rights, law, or propriety; to commit an
      offense; to trespass; to transgress.

            I am a man More sinned against than sinning. --Shak.

            Who but wishes to invert the laws Of order, sins
            against the eternal cause.            --Pope.

Source : WordNet®

sin
     n 1: estrangement from god [syn: {sinfulness}, {wickedness}]
     2: an act that is regarded by theologians as a transgression of
        God's will [syn: {sinning}]
     3: ratio of the opposite side to the hypotenuse of a
        right-angled triangle [syn: {sine}]
     4: (Akkadian) god of the moon; counterpart of Sumerian Nanna
     5: the 21st letter of the Hebrew alphabet
     6: violent and excited activity; "they began to fight like sin"
        [syn: {hell}]
     [also: {sinning}, {sinned}]

sinning
     adj : transgressing a moral or divine law; "if it be a sin to
           covet honor, I am the most sinning soul alive"-
           Shakespeare

sinning
     n : an act that is regarded by theologians as a transgression of
         God's will [syn: {sin}]

sin
     v 1: commit a sin; violate a law of God or a moral law [syn: {transgress},
           {trespass}]
     2: commit a faux pas or a fault or make a serious mistake; "I
        blundered during the job interview" [syn: {blunder}, {boob},
         {goof}]
     [also: {sinning}, {sinned}]

sinning
     See {sin}