Definition
A thing that causes a stain or blemish.
Example
The spilled ink was a sully on the beautiful tablecloth.
Conversation

I found an old painting in the attic, but it has a sully on it.

Oh no, that sounds terrible! Can it be cleaned?

I hope so, but I'm worried the sully might be permanent.

Maybe you should take it to a professional; they might know what to do.
Synonyms & Antonyms
Definition
To make something dirty or less pure, often by damaging its quality or reputation.
Example
The scandal could sully the politician's reputation.
Tense Forms
Past: sullied
Past Participle: sullied
Conversation

I can't believe he would sully his reputation like that over a silly mistake.

Yeah, it's surprising how one action can change people's opinions so quickly.

I just hope it doesn't sully our friendship as well.
Root Explanation
Sully → It originates from Old French *sullier*, meaning to soil or tarnish. The word 'sully' means to make something dirty or to tarnish its purity.
Memory Tip
Think of the Old French word for soiling something — that's why sully means to make something dirty or tarnished.
Visually Confused Words
skully
usually
surlily
sulkily
squally
besully
surly
sulky