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Webster 1913 Edition

Uncurbable

Un-curb′a-ble

,

Adj.

Not capable of being curbed.

Shak.

Webster 1828 Edition

Uncurbable

UNCURB'ABLE

,

Adj.

That cannot be curbed or checked. [Not in use.]

Definition 2024

uncurbable

uncurbable

English

Adjective

uncurbable ‎(not comparable)

Incapable of being curbed.
- 2009 April 17, Holland Cotter, “J. P. Morgan’s Shopaholic Approach to Art Collecting Gets an Update”, in New York Times:
  The score is also a reminder of what fueled Morgan’s shopping mania, uncurbable and lifelong.