uneven
definition
not equal in size, shape, or surface; irregular
example
The hilly terrain made the ground very uneven, causing us to trip frequently as we walked.
synonyms
unequalirregularbumpy
word origin — The word 'uneven' originates from the prefix 'un-' meaning 'not' and 'even', which comes from Old English 'even' meaning 'level, flat, or equal'.