The word can be learnt by simply splitting it into two words i.e UN+KEPT, which means something that is not kept well or tidy.
Meanings of Unkempt:
1. not combed
2.uncared-for or neglected; disheveled; messy
3.unpolished; rough; crude.
Sentence Examples for Unkempt:
1. Unkempt appearance led to low standards of maintenance of the other small green areas in the estate.
2. The grass lawn is slightly unkempt, and littered with wild flowers.
3. This shrub can become quite unkempt if not pruned well back.