to break in upon (somebody) or interrupt them
to alter the position or arrangement of (something)
to destroy the peace of mind or composure of (somebody)
to put (somebody) to inconvenience
to disrupt the calm tenor of (something)
The arrival of their grandchildren disturbed their quiet Sunday afternoon
disturber noun
disturbing adj
disturbingly adv
[Middle English disturben, destourben via Old French from Latin disturbare, from dis- + turbare to throw into disorder]