a hindrance or disadvantage; an undesirable or objectionable feature.

Commerce . an amount paid back from a charge made.

Government . a refund of tariff or other tax, as when imported goods are reexported.

noun

advantage , benefit , boon , extra , perfection

noun

check , defect , deficiency , detriment , difficulty , disability , evil , failing , fault , flaw , fly in the ointment , handicap , hindrance , hitch , ill , impediment , imperfection , inconvenience , lack , nuisance , obstacle , shortcoming , snag , stumbling block * , trouble , weakness , minus , burden , deduction , disadvantage , discount , impedimenta , rebate , refund