the word 'squalor' entered english in the early 17th century, directly from latin, where 'squalor' meant 'dirtiness, filth, roughness'. the latin adjective 'squalidus' ('filthy, neglected') is derived from the verb 'squalere', meaning 'to be stiff, rough, or filthy'. the core semantic link from the original latin sense of physical roughness and neglect to the modern english meaning of a state of foul and repulsive dirtiness, particularly associated with poverty, has remained remarkably consistent. it is a prime example of a loanword that has retained its precise, evocative meaning across languages and centuries.

the word is a simplex loanword from latin. it does not contain separable morphemes within its modern english spelling.