/ kwɑːm; NAmE ; kwɔːm/ noun
[ usually pl. ] qualm (about sth) a feeling of doubt or worry about whether what you are doing is right
SYN misgiving :
He had been working very hard so he had no qualms about taking a few days off.
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WORD ORIGIN
early 16th cent. (in the sense momentary sick feeling ): perhaps related to Old English cw(e)alm pain , of Germanic origin.