I know Tromchúiseach means important but in what context? Can I say , Is ábhar Tromchúiseach é an Gaeilge or is it more if something is very grave or weighty? Sometimes, I get tired of saying Tábhachtach.

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{Is geal leis an bhfiach dubh a ghearrcach féin}

trom-chúiseach - yes, this is grave, serious

important: could be mór le rá (literally "of great account")

duine mór le rá: an important person.
duine mór: an important person.
lá ana-mhór: an important day

is mór agam é: it is important to me

dá mhéid le rá é: however important it is

Can I point out that Gaeilge is feminine: an gHaeilge (or an Ghaelainn depending on dialect).

ábhar tromchúiseach = a weighty/grave subject

is táchtach an rud í an Ghaelainn

rud táchtach is ea an Ghaelainn

is mór an tácht í an Ghaelainn

ní rud suarach an Ghaelainn do chur chun cínn

ní rud gan tácht é

GRMA!

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{Is geal leis an bhfiach dubh a ghearrcach féin}