taxing

What it means

1. With respect to an experience: exhausting; draining.
2. Burdensome, difficult, exacting.

   a taxing problem

   Synonyms: demanding, stiff, punishing

In a sentence

a taxing problem

Where it comes from

Compare typologically Russian мыта́рство (mytárstvo) (< мы́тарь (mýtarʹ, “publican (tax collector)”)).