General Negativity:
* Blabber: Implies talking excessively and revealing secrets.
* Gab: To talk idly or excessively.
* Chatter: To talk rapidly and often without much substance.
* Prate: To talk foolishly or at length.
* Yatter: To talk incessantly and in a rambling way.
* Spit: To speak harshly or angrily.
Deceptive or Insincere:
* Spin: To present information in a way that is misleading or favorable to a particular point of view.
* Fabricate: To lie or make up a story.
* Prevaricate: To speak evasively or misleadingly.
* Waffle: To speak ambiguously or evasively.
Aggressive or Hostile:
* Rile: To provoke or irritate someone with words.
* Bait: To deliberately provoke someone with insulting or provocative remarks.
* Harangue: To deliver a long, angry, or aggressive speech.
* Berate: To criticize someone harshly or abusively.
* Rebuke: To criticize someone sharply.
Other:
* Squeal: To betray someone or reveal information that should be kept secret.
* Snitch: To inform on someone.
* Whine: To complain in a weak or childish way.
* Brag: To boast about oneself or one's accomplishments.
The best synonym for "speak" will depend on the specific context and the desired nuance.