Synonyms for Talk off top of head:

• v.

  •ramble (verb)
  • get off the subject,
  • Excurse,
  • lose the thread,
  • harp on,
  • beat around bush,
  • talk nonsense,
  • rant and rave,
  • be diffuse.

• Other synonyms:

  •Other relevant words:
  • ramble.

Antonyms for Talk off top of head:

• v.

  • ramble
    curtail, be direct, compress, go direct, abridge, stay, lessen, decrease, reduce, condense, shorten.