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Definitions

heavy-duty

[hev-ee-doo-tee, -dyoo-] / ˈhɛv iˈdu ti, -ˈdyu- /
ADJECTIVE
big
Synonyms
STRONGEST
considerable leading main popular powerful serious significant substantial valuable
WEAK
big-league big-time consequential eminent heavyweight influential major-league material meaningful momentous paramount prime principal prominent super supercolossal weighty
Antonyms
STRONGEST
insignificant little minor small subordinate trivial unimportant
WEAK
adolescent baby babyish blah bland dull humble infant infantile itsy juvenile selfish shy tiny unconfident ungenerous ungiving
ADJECTIVE
big
Synonyms
STRONGEST
colossal considerable enormous fat full gigantic hefty huge immense massive sizable substantial tremendous vast
WEAK
a whale of a ample awash brimming bulky burly capacious chock-full commodious copious crowded extensive heavyweight hulking humongous husky jumbo mammoth mondo monster oversize packed ponderous prodigious roomy spacious strapping stuffed supercolossal thundering voluminous walloping whopper whopping
Antonyms
STRONGEST
impoverished inconsiderable insignificant little miniature minute poor slight small teeny thin tiny unimportant
WEAK
adolescent baby babyish blah bland dull humble infant infantile itsy juvenile selfish shy unconfident ungenerous ungiving
ADJECTIVE
large-scale
Synonyms
STRONGEST
extensive huge large massive sizable substantial
WEAK
a whale of a ample awash brimming bulky bull burly capacious chock-full colossal commodious considerable copious crowded enormous fat full gigantic good great healthy heavyweight hefty hulking humongous husky immense jumbo mammoth mondo monster oversize packed ponderous prodigious roomy spacious strapping stuffed supercolossal thundering tremendous vast voluminous walloping whopper whopping
Antonyms
STRONGEST
little miniature short small tiny
ADJECTIVE
puissant
Synonyms
WEAK
able able-bodied active athletic big capable durable enduring energetic firm fixed forceful forcible hale hard as nails hardy hearty heavy in fine feather mighty muscular potent powerful reinforced robust rugged secure sinewy solid sound stable stalwart stark staunch steady stout strapping sturdy substantial tenacious tough unyielding vigorous well-built well-founded well-made
ADJECTIVE
strong
Synonyms
STRONGEST
durable secure solid stable sturdy unbreakable well-made
WEAK
firm hard reinforced tough

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

In Chiang Mai, doctor Thanakrit Im-iam was wearing a heavy-duty respirator to protect himself.

From Barron's • Apr. 3, 2026

Beyond its free version of ChatGPT, OpenAI offers an $8 Go plan for casual users, the standard $20 Plus plan and a $200 Pro tier for heavy-duty developers.

From MarketWatch • Mar. 25, 2026

Air activity has increased significantly here in the last 72 hours, with the United States putting in some of its heavy-duty bomber forces.

From BBC • Mar. 9, 2026

Today, that piglet is Tucker—a 200-pound porker who has outgrown the family bathroom, shredded a couch and required the installation of heavy-duty horse panels to keep him from escaping the yard of his Arizona home.

From The Wall Street Journal • Mar. 3, 2026

“I mean, I can do a lotta stuff. But initiating someone as a shadowshaper, that’s like...that’s on the heavy-duty elder tip. I’m just not there yet.”

From "Shadowshaper" by Daniel José Older