margin
edge, border
vagrant
erratic, wandering
placidly
unhurriedly, leisurely
vexation
irritation, agitation
aridity
dryness, drought
perennial
recurrent, seasonal
fatigue
exhaustion, tiredness, lethargy
drudgery
chore, tedious labor, hard work
stalwart
strong, bold, daring
to toil
to work hard, to slave away