Disturbing
Part of speech: adjective
Definition: Causing distress or worry; upsetting or unsettling.
Part of speech: verb
Definition: Present participle of disturb.
Example sentence: We have a disturbing cultural appetite for novelty, and it seems to me wrong each new laureate should dislodge the ideas of his or her predecessor, especially when they're still unfolding.
Worrying
Part of speech: verb
Definition: To be troubled; to give way to mental anxiety or doubt.
Part of speech: adjective
Definition: Of or pertaining to worry.
Example sentence: There's no point in worrying about things you can't influence.