arduous
‘difficult to perform, hard to do’
Lexical development traced from the Tamil root:
Lat. arduus ‘high, steep’ < Gk. orthos ‘straight, true, correct, regular’ < aad < eredh- < Tamil uṟu
arduous
Technical words derived from 'arduous'
arduous - செங்குத்தான, வரமுடியாத.
English words derived from Tamil uṟu connoting ‘excess’