modified
Tireless
indefatigable, unwearied, unflagging, unsleeping; see active 2, tireless.
Unlimited
limitless, unbounded, boundless, never-ending; see endless 1, infinite 1, unlimited.
See inexhaustible in Webster's New World Roget's A-Z Thesaurus II
Having or showing a capacity for protracted effort, regardless of difficulty or frustration:
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Also Mentioned In
» courtesy
» extempore
» indefatigable
» infinite
» jute
» plentiful
» ramify
» unfailing
» unlimited
» widow's cruse
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