Synonyms of disruptive

2 Syllables
troublous, off-base, rowdy
3 Syllables
out-of-line, disturbing, perturbing, unsettling, upsetting, distracting, unruly, distressful
4 Syllables
divisive, out-of-order, troublemaking, aggressive, troublesome, disorderly, obstreperous
5 Syllables
indisciplined, confrontational