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Harry Potter and the Order of the Phoenix  - J.K. Rowling

...the witch to the right of Fudge leaned forwards so that Harry saw her for the first time.

 

He thought she looked just like a large, pale toad. She was rather squat with a broad, flabby face, as little neck as Uncle Vernon and a very wide, slack mouth. Her eyes were large, round and slightly bulging. Even the little black velvet bow perched on top of her short curly hair put him in mind of a large fly she was about to catch on a long sticky tongue.

 

"The Chair recognises Dolores Jane Umbridge, Senior Undersecretary to the Minister," said Fudge.

 

The witch spoke in in a fluttery, girlish, high-pitched voice that took Harry aback; he had been expecting a croak.

 

"I'm sure I must have misunderstood you, Professor Dumbledore," she said, with a simper that left her big, round eyes as cold as ever. "So silly of me. But it sounded for a teensy moment as though you were suggesting that the Ministry of Magic had ordered an attack on this boy!"

 

HATE! HAAAATTTTEEEE!!!

 

The actress that played her was fabulous, but I think she's my most hated character in literature.