The Lativ adverb "gravitus" is not even very common in Latin; it comes from the verb to weigh down, gravatre--see following entry:

gravitus             ADV    POS                        
gravo, gravare, gravavi, gravatus V (1st) TRANS   [XXXBO]
load/weigh down; burden, oppress; pollute (air); accuse, incriminate; aggravate
gravis, grave, gravior -or -us, gravissimus -a -um ADJ   [XXXAX]
heavy; painful; important; serious; pregnant; grave, oppressive, burdensome;
gravor, gravari, gravatus sum V (1st) DEP   [XXXDX]    lesser
show/bear with reluctance/annoyance; be burdened/vexed; take amiss; hesitate;

THis is also where we get the English word "gravid" applied to thiose who are visibly pregnant.


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