PERTURBING
distressing, distressful, disturbing, perturbing, troubling, worrisome, worrying
(adjective) 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® 3.1
Verb
perturbing
present participle of perturb
Source: Wiktionary
PERTURB
Per*turb", v. t. Etym: [L. perturbare, perturbatum; per + turbare to
disturb, fr. turba a disorder: cf. OF. perturber. See Per-, and
Turbid.]
1. To disturb; to agitate; to vex; to trouble; to disquiet.
Ye that . . . perturb so my feast with crying. Chaucer.
2. To disorder; to confuse. [R.] Sir T. Browne.
Source: Webster’s Unabridged Dictionary 1913 Edition