different between assiduous vs untiring

English

Etymology

From Latin assiduus from assidere (“to sit down to”), from ad- (“to”) + sedere (“to sit”).

Cognate (via assidere) to assess.

Pronunciation

• (UK) IPA^(key): /??s?dju??s/
• (General American) IPA^(key): /??s?d?u??s/

Adjective

assiduous (comparative more assiduous, superlative most assiduous)

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

   Synonyms: meticulous, diligent, sedulous; see also Thesaurus:industrious

   • 1917, P. G. Wodehouse, "Bill the Bloodhound" in The Man With Two Left Feet and Other Stories:

     A good deal of assiduous attention had enabled Henry to win this place in her affections.

   • 2009, Will Pavia, "Allen Klein, accountant turned manager of the Beatles, dies at 77," The Times (UK), 6 July:

     Klein rose to prominence in the 1960s by assiduous application of accounting methods to the music industry.

Usage notes

• Since the 18th century, this term has sometimes carried a connotation of servility.

Derived terms

• assiduously
• assiduousness

Related terms

Translations

References

English

Etymology

From un- +? tiring

Adjective

untiring (not comparable)

1. Not able to be tired; inexhaustible.
2. Unfailing; resolute.
   • 1913, Elizabeth Kimball Kendall, A Wayfarer in China

     A generation ago Chien-ch'ang was perhaps the least known part of all China to the outside world. About the middle of the thirteenth century the Mongol, Kublai Khan, acting as general of the forces of his brother, Genghis Khan, went through here to the conquest of Tali, then an independent kingdom in the southwest, and the untiring Venetian following in his train noted a few of the characteristics of Caindu, the name he gave both to the valley and the capital city.

Synonyms

• tireless

Translations

References

• “untiring” in the Cambridge English Dictionary, Cambridge: Cambridge University Press.