| adj. |
| [1] |
demanding
,
taxing
,
tough
,
arduous
,
laborious
,
toilsome
,
burdensome
,
tiring
,
exhausting
,
difficult
,
hard
,
uphill
|
| [2] |
energetic
,
arduous
,
straining
,
active
,
vigorous
,
enthusiastic
,
zealous
,
earnest
,
dynamic
,
intense
,
indefatigable
,
tireless
,
persistent
,
dogged
,
determined
,
tenacious
,
pertinacious
,
resolute
,
sincere
,
eager
|
|
