Crudely

The crudely constructed bridge swayed in the wind and was unstable.

The engineer crudely designed the bridge, resulting in structural issues.

The detective crudely reconstructed the crime scene, without accounting for all the evidence.

He crudely assembled the machine, resulting in a malfunctioning product.

The technician crudely repaired the machine, resulting in further damage.

The computer program was crudely coded, resulting in frequent crashes and errors.