heavy–duty

heavy–duty /ˈhɛviˈduːti/ Brit /ˈhɛviˈdjuːti/ adjective
heavy–duty
/ˈhɛviˈduːti/ Brit /ˈhɛviˈdjuːti/
adjective
Britannica Dictionary definition of HEAVY–DUTY
[more heavy–duty; most heavy–duty]
1 
: designed to do difficult work without breaking
2 
US : very intense or serious