「反效果」

(pos:名詞)
<explanation>
yue:同期望相反嘅效果；得唔到本來期望嘅好處，反而有另一啲壞處嘅結果
eng:bad effect; result that is contrary to one's wish
<eg>
yue:醫生話燕窩雖然有益，但燕窩有毛粒，會對有敏感人士造成反效果。 (ji1 sang1 waa6 jin3 wo1 seoi1 jin4 jau5 jik1, daan6 jin3 wo1 jau5 mou4 nap1, wui5 deoi3 jau5 man5 gam2 jan4 si6 zou6 sing4 faan2 haau6 gwo2.)
eng:The doctor points out that although birdnest is beneficial to health, it contains furry particles which might adversely affect those who have allergies.