What is the meaning of troubling?

verb

• Move deeply.
  • usage: "This book upset me"; "A troubling thought"
  • synonyms: disturb, upset, trouble
• To cause inconvenience or discomfort to.
  • usage: "Sorry to trouble you, but..."
  • synonyms: trouble, put out, inconvenience, disoblige, discommode, incommode, bother
• Disturb in mind or make uneasy or cause to be worried or alarmed.
  • usage: "She was rather perturbed by the news that her father was seriously ill"
  • synonyms: perturb, unhinge, disquiet, trouble, cark, distract, disorder
• Take the trouble to do something; concern oneself.
  • usage: "He did not trouble to call his mother on her birthday"; "Don't bother, please"
  • synonyms: trouble oneself, trouble, bother, inconvenience oneself
• Cause bodily suffering to and make sick or indisposed.
  • synonyms: trouble, ail, pain

adjective

• Causing distress or worry or anxiety.
  • usage: "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"
  • synonyms: distressing, distressful, disturbing, perturbing, worrisome, worrying