"troubling" in the verb sense
1. disturb, upset, trouble
move deeply
"This book upset me"
"A troubling thought"
2. trouble, put out, inconvenience, disoblige, discommode, incommode, bother
to cause inconvenience or discomfort to
"Sorry to trouble you, but..."
3. perturb, unhinge, disquiet, trouble, cark, distract, disorder
disturb in mind or make uneasy or cause to be worried or alarmed
"She was rather perturbed by the news that her father was seriously ill"
4. trouble oneself, trouble, bother, inconvenience oneself
take the trouble to do something concern oneself
"He did not trouble to call his mother on her birthday"
"Don't bother, please"
5. trouble, ail, pain
cause bodily suffering to and make sick or indisposed
"troubling" in the adjective sense
1. distressing, distressful, disturbing, perturbing, troubling, worrisome, worrying
causing distress or worry or anxiety
"distressing (or disturbing) news"
"lived in heroic if something distressful isolation"
"a disturbing amount of crime"
"a revelation that was most perturbing"
"a new and troubling thought"
"in a particularly worrisome predicament"
"a worrying situation"
"a worrying time"
Source: WordNet® (An amazing lexical database of English)
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