These adjective + noun combinations cannot be translated literally. Using wrong adjectives is a very common error at B2 level.
strong evidence
convincing proof — NOT powerful or heavy evidence
heavy traffic
a lot of traffic on the roads — NOT big or strong traffic
high unemployment
a large number of unemployed people — NOT big unemployment
deep concern
serious worry — NOT big concern
broad range
a wide variety — NOT big or large range
close relationship
a near connection — NOT near relationship