exhausting

/ɪɡˈzɔːstɪŋ/
adjective
  1. Causing extreme tiredness or draining of energy.
    • Taking care of three young children can be exhausting.
    • Running a marathon is an exhausting experience.
    • The exhausting heat made it hard to concentrate on work.
verb
  1. Present participle of exhaust: to use up or drain completely.
    • The constant noise is exhausting my patience.
    • She is exhausting all possible options before giving up.
    • The hikers were exhausting their water supply faster than expected.