Ma'anar ƙamus na kalmar "bai dace ba" yana cikin hanyar da ba ta dace ba, bai dace ba, ko kuma bai dace da wani yanayi, mahallin, ko manufa ba. Yana ba da shawarar cewa aikin ko hali bai dace ba, daidai, ko karɓuwa a ƙarƙashin yanayi, kuma yana iya zama mara kyau, mara kyau, ko rashin kulawa. Ana amfani da kalmar "ba daidai ba" sau da yawa don bayyana ayyuka, ɗabi'a, ko yare waɗanda ake ɗauka mara kyau, rashin dacewa, ko rashin karɓuwa a cikin wani wuri na musamman, kamar wurin aiki, taron jama'a, ko wuraren jama'a.