~ににあわず (に似合わず ) => ~Different from N1
Evaluate
合う => do something together N3
~こと請け合い => I guarantee ... N1
Happens next
[合「あ」]う => To do A together/mutually N4
Secondary Verb
場合(は) => in the event of; in the case that ~ N4
…ず、…ず => No... but also no... N1
Explain
とはくらべ[物「もの」]にならない => It's no match for A N1
Comparison/ Exchange
ずにすませる => Get something done without doing A N1
Miscellaneous
~ないではすまない / ずにはすまない      => must; will definitely; can't help but to ~ N1
ずにはすまない/ないではすまない => A must be done N1
Potential, Possibility
...ず => without doing N3
Determined, determined
ずにすむ => Not doing A will suffice; Can get by without doing A N1
Need/Requirements