Dictionary

1. (

• indefatigable ,
• tireless ,
• unflagging ,
• unwearying

) showing sustained enthusiastic action with unflagging vitality; "an indefatigable advocate of equal rights"; "a tireless worker"; "unflagging pursuit of excellence" ;

2. (

• unfailing ,
• unflagging

) unceasing; "unfailing loyalty"; "unfailing good spirits"; "unflagging courtesy" ;