unflagging

Mane (Îngilîzî)

Never tiring or lacking energy; without rest; without slowing.

Hevwate

tireless

unfailing

indefatigable

unwavering

constant

unwearying

relentless

staying

sure-fire

unabated

undiminished

unfaltering

unflinching

unhesitating

unimpaired

unswerving

untiring

unweary

up

🆙

upstanding

assiduous

tyreless

dogged

enduring

erect

irreducible

persistent

Werger

infatigable

instancabile

inlassable

unermüdlich

incansable

incansável

ακούραστος

incansable

increvable

inesgotável

onverflauwd

infaticabile

nimmermüde

onvermoeibaar

yorulmaz

Etîmolojî (Îngilîzî)

From un- + flagging.