You were in gravest peril while you wore the Ring,
Strider looked down at Bilbo gravely.
’So it was indeed,’ answered Elrond gravely.
If the return to Iarwain be thought too dangerous, then flight to the Sea is now fraught with gravest peril.
"So you have come, Gandalf," he said to me gravely; but in his eyes there seemed to be a white light, as if a cold laughter was in his heart.
’None here can do so,’ said Elrond gravely.
He looked gravely at Frodo.
’You speak gravely,’ said Elrond, ’but I am in doubt.
’He would be rash indeed that said that thing,’ said Galadriel gravely.
On him alone is any charge laid: neither to cast away the Ring, nor to deliver it to any servant of the Enemy nor indeed to let any handle it, save members of the Company and the Council, and only then in gravest need.
There are no more uses of "grave" in the book.
Show samples from other sources
Her smile disappeared as she suddenly realized the gravity of her situation.
It was the day of the funeral and she was in a grave mood.