Definitions
1.AdjectiveLate, tardy, overdue, behind (in accomplishing a task, etc.).
2.AdjectiveNot at the expected point of completion.
3.AdjectiveBehind (someone or something moving, a trend, etc.), lagging behind, not keeping up.
4.AdjectiveBehind in paying a debt; in arrears.
5.AdjectiveNot having enough of, lacking (in something).
6.AdjectiveInferior, less advanced (compared with someone in something).
7.AdverbBelatedly, tardily.
8.AdverbIn debt, or in arrears.