Answer: taxing

AnswerCrossword Clue
TAXING

Burdensome

TAXING

Arduous

TAXING

Levying levies

TAXING
Difficult
TAXING
None too easy
TAXINGPutting a strain on.
TAXINGDemanding.
TAXINGTrying
TAXINGIRS activity
TAXINGOppressive
TAXINGStrenuous