Synonyms of heavy-duty

1 Syllable

hale, firm, tough, strong, stout, staunch, sound, big, stark

2 Syllables

heavy, bigger, well-made, strapping, biggest, stalwart, able, rugged, mighty, puissant, strongest, well-built, fixed, stable, solid, stronger, sturdy, hearty, hardy, steady, robust, buller

3 Syllables

active, enduring, unyielding, durable, capable, athletic, forcible, muscular, vigorous, tenacious, reinforced, sinewy, well-founded, bigtime, secure, substantial, forceful

4 Syllables

large-scale, able-bodied, energetic