the word 'tardy' entered english in the late 15th century from the old french 'tardif', meaning 'slow' or 'late'. this french term itself evolved from the latin adjective 'tardus', which carried the same meanings of 'slow', 'sluggish', or 'late'. the latin 'tardus' is of obscure origin, though some scholars suggest a possible connection to the proto-indo-european root terh₂- meaning 'to cross, pass over, overcome', with a semantic shift towards 'lingering' or 'held back'. the journey from a potential ancient sense of being delayed in passage to the modern, concrete meaning of being late captures the word's logical evolution.

the word 'tardy' is a simplex loanword from french, derived from latin. it is not productively formed from smaller, recognizable english morphemes.