a minor blunder in speech or writing, e.g. a grammatical error
a deviation from what is proper or normal, esp a breach of etiquette or decorum
solecistic /-ʹsistik/ adj
[Latin soloecismus from Greek soloikismos, from soloikos speaking incorrectly, literally ‘inhabitant of Soloi’, a city in ancient Cilicia where a substandard form of Attic was spoken]