Assiduous vs. Indefatigable — What's the Difference?

Showing great care and perseverance

Having or showing a capacity for persistent effort; not tiring or relenting

Showing or characterized by persistent attention or untiring application

Extremely persistent and untiring.

Hard-working, diligent or regular (in attendance or work); industrious.

Incapable of being fatigued; not readily exhausted; unremitting in labor or effort; untiring; unwearying; not yielding to fatigue; as, indefatigable exertions, perseverance, application.

Constant in application or attention; devoted; attentive; unremitting.

Showing sustained enthusiastic action with unflagging vitality;

Performed with constant diligence or attention; unremitting; persistent; as, assiduous labor.

Marked by care and persistent effort;