the GNU version of the Collaborative International Dictionary of English
adj. Not capable of being checked or stopped.
The Century Dictionary and Cyclopedia
Not capable of being checked or hindered; that may not be stopped suddenly or forcibly. Incapable of being checked or examined.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. incapable of being checked or restrained
Word Usage
"He had also provided Mr Vermaak with an end-user certifacte stating the weapons were destined for Lebanon, but that the certificate was "uncheckable"."