importar
/impoɾˈtaɾ/ · A1 · verb
to matter, to be important [with a ‘someone’]
📦 importar = im (in) + portar (carry): what you carry in is what matters
From Latin importare, to bring in. English import and important share this root: something that carries weight inwards matters. So no me importa = it carries no weight for me, i.e. I don't care.