trouble

/ˈtrə-bəl/

noun

  1. the quality or state of being troubled especially mentally

  2. public unrest or disturbance

  3. an instance of trouble

verb

  1. to agitate mentally or spiritually : worry, disturb

  2. to put to exertion or inconvenience

  3. to produce physical disorder in : afflict

I'm sorry to trouble you

idiom

  1. without the occurrence of any problems

So far, the trip has been trouble free.