heavy-duty

heavy-duty (comparative more heavy-duty, superlative most heavy-duty)

1. Designed to withstand hard usage without breaking.

   Antonym: light-duty

   • 1960 April, “Restaurant cars and multiple-units”, in Trains Illustrated, page 222:

     The cars are constructed to the normal B.R. standard coach specifications and mounted on heavy-duty B.R.2 type bogies with B.T.R. rubber vibro-insulators on the bearing springs.

2. (informal) Very serious, intense, or demanding.
   • 2001 January 8, Michael Braga, “Prepackaged programming”, in The St. Petersburg Times‎:

     Stewart has 18 years of programming experience, and he's one of only a handful of people at the St. Petersburg computer consulting company who can handle such heavy-duty programming. Such skills can earn a programmer of Stewart's caliber about $70,000 a year.

   • 2017 September 11, Matt Simon, “The Astonishing Engineering Behind America's Latest, Greatest Supercomputer”, in Wired‎:

     Summit still has to ... summit some final steps before it can start crunching heavy-duty science.

   • 2021 October 8, Joel Drucker, “In an All-American battle, Anisimova shows Scott the ropes”, in Tennis‎:

     No matter how great a football prospect is, they’re often only gradually exposed to the rigors of heavy-duty competition.

• heavy-duty vehicle

• industrial-strength

• “heavy-duty”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.