How do you say What is your least favourite subject in welsh?

The most natural way to say "What is your least favorite subject?" in Welsh is:

Beth yw'r pwnc lleiaf hoff gen ti?

Here's a breakdown:

* Beth - What

* yw - is

* 'r - the

* pwnc - subject

* lleiaf - least

* hoff - favorite

* gen - with (used to show possession)

* ti - you

Let me know if you'd like to know how to say other phrases in Welsh!