the GNU version of the Collaborative International Dictionary of English
n. The state of being indefatigable.
The Century Dictionary and Cyclopedia
n. The state or quality of being indefatigable; unweariedness; persistency.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. tireless determination
Word Usage
"Strong, proud and human – no flipper for her, though her feet are draped with seaweed – this mermaid's jaw suggests the same patient indefatigability as that of the town she symbolises."