'uneven-lobed' originates from English, formed by combining the adjective 'uneven' and the past-participial adjective 'lobed', where 'uneven' meant 'not level or equal' and 'lobe' meant 'a rounded projection or division'.

'uneven' developed in English from the prefix 'un-' plus 'even' (Old English 'efen' meaning 'level, even'), while 'lobe' comes from Latin 'lobus' via Medieval Latin and Old French; the compound 'uneven-lobed' is a modern descriptive formation used in botanical and anatomical contexts.

Initially, the elements separately referred to 'not even' and a 'rounded projection' respectively; over time the compound came to specifically describe structures whose lobes are unequal in size or shape, a specialized descriptive term.