troubling vs distressful

troubling and distressful both are adjectives.

Word	Noun	Adjective	Verb	Adverb
troubling	No	Yes	No	No
distressful	No	Yes	No	No

As adjectives, troubling and distressful are synonyms defined as:

Other synonyms of troubling include distressing, disturbing, perturbing, worrisome, worrying.

troubling (adjective)	distressful (adjective)
causing distress or worry or anxiety	causing distress or worry or anxiety