shoddy
Definitions
Badly made or done with a lack of care or quality.
Lacking in integrity or honesty; inferior or dishonest.
Examples
The contractor was fired after the client discovered the shoddy workmanship on the new deck.
I was disappointed to find that the cheap toy was made with such shoddy materials.
The report was dismissed by the committee because it was based on shoddy research and inaccurate data.