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1.
An insult disguised as a compliment, originating from The Simpons episode Father Knows Worst. The disguise can be very obvious or very subtle.
Example unsult: "Lenny, it takes a lot of courage to wear suspenders while you're not performing in the circus."
by OnipSemaj April 30, 2009
 
2.
A sup-par insult that does not aquire full fledged insult status. Usually an online flame/diss that is retarded and makes little sense.
what an UNSult..haha fag.
by Nigaa whaaaaat? March 11, 2005