mitigate

verbs

lessen or to try to lessen the seriousness or extent of
"The circumstances extenuate the crime"
extenuate, mitigate, palliate
is derived from
mitigative
is derived from
mitigatory
is derived from
mitigation
is derived from
mitigation
make less severe or harsh
"mitigating circumstances"
mitigate
is derived from
mitigative
is derived from
mitigatory
is derived from
mitigable
is derived from
mitigation
is a type of (narrower)
make smaller
"He decreased his staff"
decrease, lessen, minify