heavy-duty

[hev-ee-doo-tee, -dyoo-]
adjective
1.
providing an unusual amount of power, durability, etc.: heavy-duty machinery; heavy-duty shoes.
2.
very important, impressive, or serious: heavy-duty involvement; heavy-duty questions.

Origin:
1910–15

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
heavy-duty
 
n
1.  made to withstand hard wear, bad weather, etc: heavy-duty uniforms
2.  subject to high import or export taxes

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Lift meat from grill and wrap each piece in a double layer of heavy-duty foil,
  sealing tightly.
They found the biggest bang in the biggest vehicles: heavy-duty trucks and
  military vehicles.
But the heavy-duty diesels employed in ships still have a long way to go.
Most heavy-duty machinery is still out repairing the main roads, so local roads
  are often being restored by hand.
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