arduously
Adverb
Meaning
In an arduous manner; with difficulty or laboriousness.
Source: Webster's dictionarySynonyms
hard
heavily
roughly
carefully
badly
hardly
intensely
diligently
inconveniently
indefatigably
severely
vigorously
painfully
agonizingly
ponderously
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Antonyms
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they worked arduously
The staff at WD works arduously to make sure that operations run smoothly during production days.
San Pedro police are arduously following up on the matter but so far there has not been any breakthrough in the investigation.