The word 'infrequently-associated' is a compound adjective formed by combining 'infrequently' and 'associated'. 'Infrequently' originates from the Latin 'infrequens', meaning 'not frequent', and 'associated' comes from the Latin 'associatus', meaning 'joined with'.

'Infrequently' evolved from the Latin 'infrequens' through Old French 'infrequent', while 'associated' evolved from the Latin 'associatus' through Old French 'associer'.

Initially, 'infrequently' meant 'not occurring often', and 'associated' meant 'joined with'. The compound adjective 'infrequently-associated' retains these meanings, indicating a rare connection.