1. unflagging - Adjective
2. unflagging - Adjective Satellite
showing sustained enthusiastic action with unflagging vitality
unceasing
Source: WordNetContinuous, unflagging effort, persistence and determination will win. Let not the man be discouraged who has these. James Whitcomb Riley
We are proud of our past and our present and we face the future with unflagging determination. Mohammed bin Rashid al-Maktoum
For unflagging interest and enjoyment, a household of children, if things go reasonably well, certainly all other forms of success and achievement lose their importance by comparison. Theodore Roosevelt
Many of the qualities that come so effortlessly to dogs - loyalty, devotion, selflessness, unflagging optimism, unqualified love - can be elusive to humans. John Grogan
an indefatigable advocate of equal rights Source: Internet
a tireless worker Source: Internet