1) Annoying 2) Annoying or difficult 3) Bothersome 4) Difficult 5) Difficult to deal with 6) Disorderly 7) Disrupting 8) Distracting 9) Disturbing 10) Hard 11) Incommodious 12) Inconvenient 13) Irritating 14) Nagging 15) Niggling 16) Troublemaking 17) Unruly 18) Unsettling 19) Upsetting 20) Vexing 21) Worrisome 1) Bad 2) Bothersome 3) Burdensome 4) Cumbersome 5) Detrimental 6) Difficult 7) Discordant 8) Hard 9) Importunate 10) Inconvenient 11) Infernal 12) Irritating 13) Onerous 14) Pesky 15) Unhappy 16) Upsetting 
• (a.) Giving trouble or anxiety; vexatious; burdensome; wearisome.
[adj] - difficult to deal with
troublesome, troublesomely, troublesomeness 1. Difficult to deal with. 2. Causing difficulties or taking a great deal of time. 3. producing annoyance, discomfort, or anxiety, especially in a recurrent way; such as, having a troublesome knee or a hip pain.'
adjective difficult to deal with; `a troublesome infection`; `a troublesome situation`