'modernly-kept' originates from the combination of 'modernly,' an adverb form of 'modern,' and 'kept,' the past participle of 'keep.'

'Modernly' evolved from the adjective 'modern,' which comes from the Latin 'modernus,' meaning 'of today.' 'Kept' is the past participle of 'keep,' which has Old English origins from 'cepan.'

Initially, 'modern' referred to something 'of the present time,' and 'kept' meant 'maintained.' Together, they imply something maintained in a contemporary style.