1) Bothersome 2) Distressful 3) Distressing 4) Disturbing 5) Perturbing 6) Vexatious 7) Vexing 8) Worrying 1) Distressful 2) Distressing 3) Disturbing 4) Heavy 5) Perturbing 6) Worrisome 7) Worrying 
• (p. pr. & vb. n.) of Trouble
Troubling is the collective noun for a group of goldfish.
trouble, troubling, troubled, troubledness 1. A condition of distress, affliction, difficulty, or need: 'He tried to console them in their trouble.' 2. A distressing or difficult circumstance or situation: 'She has had troubles ever since she took this job.' 3. A cause or source of distress, disturbance, or difficulty: 'The new students were a tr...