The answer is:
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Grave (v. t.) — To clean, as a vessel's bottom, of barnacles, grass, etc., and pay it over with pitch; -- so called because graves or greaves was formerly used for this purpose.
Grave (superl.) — Of great weight; heavy; ponderous.
Grave (superl.) — Of importance; momentous; weighty; influential; sedate; serious; -- said of character, relations, etc.; as, grave deportment, character, influence, etc.
Grave (superl.) — Not light or gay; solemn; sober; plain; as, a grave color; a grave face.
Grave (superl.) — Not acute or sharp; low; deep; -- said of sound; as, a grave note or key.