Science Squabbling

You don't need to speak Latin, the English word gravity means the same.

Seriously?

Yep, look it up if you don't believe me. Using gravitas where gravity would do (in the sense of seriousness or dignity of manner or speech) is just pretentious, and I know whereof I speak :-)

Nope. :)

(a) I wasn't writing Latin, but English, in which 'gravitas' is a loan word just like 'gravity'. That they're both derived from the Latin word 'gravitas' despite sounding slightly different doesn't change that.
(b) 'Gravity' in English has multiple meanings, whereas 'gravitas' has only the one (and that's the one I intended).
(c) 'Gravity' even in the one meaning related to that of 'gravitas' has a subtly different meaning, which as usual in English is largely demarcated through different usage (and the fact that with words that have multiple meanings it is often the case that some of those meanings become dominant, which often affects the usage of the word in other meanings).
(d) Using 'gravitas' also makes the link to its Roman origin clearer:

https://en.wikipedia.org/wiki/Gravitas

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