"gravely" in the adverb sense
1. gravely, soberly, staidly
in a grave and sober manner
"he walked soberly toward the altar"
2. badly, severely, gravely, seriously
to a severe or serious degree
"fingers so badly frozen they had to be amputated"
"badly injured"
"a severely impaired heart"
"is gravely ill"
"was seriously ill"
Source: WordNet® (An amazing lexical database of English)
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