'irregularly-kept' originates from the combination of 'irregularly' and 'kept', where 'irregularly' is derived from Latin 'irregularis', meaning 'not regular', and 'kept' is the past participle of 'keep', from Old English 'cēpan', meaning 'to seize or hold'.

'irregularly-kept' combines the adverb 'irregularly' with the past participle 'kept', forming a compound adjective to describe something maintained in an inconsistent manner.

Initially, 'irregularly' meant 'not regular', and 'kept' meant 'maintained'. Together, they describe something maintained inconsistently.