"a dangerous operation"
"a grave situation"
"a grave illness"
"grievous bodily harm"
"a serious wound"
"a serious turn of events"
"a severe case of pneumonia"
"a life-threatening disease"

"a grievous loss"
"a grievous cry"
"her sigh was heartbreaking"
"the heartrending words of Rabin's granddaughter"

"grave responsibilities"
"faced a grave decision in a time of crisis"
"a grievous fault"
"heavy matters of state"
"the weighty matters to be discussed at the peace conference"

"murder is an atrocious crime"
"a grievous offense against morality"
"a grievous crime"
"no excess was too monstrous for them to commit"