How do you say so hard to trust in Filipino or Tagalog?

Here are a few ways to say "so hard to trust" in Filipino or Tagalog, with varying levels of formality and intensity:

Formal:

* Napakahirap magtiwala. (This is the most direct translation and is very formal.)

* Napakahirap paniwalaan. (This emphasizes the difficulty of believing someone.)

* Napakahirap magbigay ng tiwala. (This focuses on the act of giving trust.)

Informal:

* Ang hirap magtiwala. (This is a more casual way to say it.)

* Grabe, ang hirap talagang magtiwala. (This adds emphasis and emotion.)

* Parang ang hirap magtiwala. (This suggests doubt and hesitation.)

Figurative:

* Parang nakatikim na ng pagtataksil, kaya nahihirapan magtiwala. (This compares the situation to experiencing betrayal.)

* Ang tigas ng ulo, kaya mahirap magtiwala. (This implies that someone is stubborn and difficult to trust.)

You can choose the phrase that best fits the context and your desired level of formality.