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Adjective: untiring  ún'tIuring
  1. Characterized by hard work and perseverance
    - hardworking, industrious, tireless

See also: diligent

Nearest

untied
untier
until
until now
untilled
untimbered
untimeliness
untimely
untipped
untired
untiring
untitled
unto
untoasted
untold
untoothed
untouchable
untouched
untoughened
untoward
untraceable