The Oxford Thesaurus An A-Z Dictionary of Synonyms - tardy adj.

1) late, unpunctual, behind schedule, overdue, behindhand: Yet again you have been somewhat tardy in completing your assignments. 2) slow, dilatory, belated, slack, retarded, sluggish, reluctant, indolent, lackadaisical, listless, phlegmatic, slothful, lethargic, languid: They have been tardy in acknowledging the importance of Allen's work.