Improperly Synonyms
Words/phrases that have a similar definition to the word "improperly" include...indecently, rudely, unacceptably, inadequately, unlawfully, criminally, inopportunely, irregularly, offensively, incorrectly, dishonestly, wrongly, crookedly, shockingly, reprehensively, inappropriately, illicitly, unsuitably, unfittingly, illegally, shadily
Other words in thesaurus...