In Shakespeare s play, The Tempest, the character Prospero has taught Caliban, an

In Shakespeare's play, The Tempest, the character Prospero has taught
Caliban, an island native and now Prospero's servant, how to speak. In this
excerpt, Prospero argues with Caliban.
PROSPERO
I pitied thee,
Took pains to make thee speak, taught thee each hour
One thing or other: when thou didst not, savage,
Know thine own meaning, but wouldst gabble like
A thing most brutish, I endow'd thy purposes
With words that made them known.
What can be inferred about Caliban based on Prospero's choice of the word
gabble?