oppressive

Burdensome or difficult to bear.

The oppressive tax laws made it difficult to start a small company.

Tyrannical or exercising unjust power.

oppressive smell

Weighing heavily on the spirit; being quite intense, excessive or overwhelming.

Will the oppressive heat of summer never end?

Without being slaves in fact, their condition is little better than vassalage in its most oppressive form.

Hot and humid.