'sporadically-noticed' originates from the combination of 'sporadic' and 'noticed'. 'Sporadic' comes from the Medieval Latin 'sporadicus', meaning 'scattered', and 'noticed' is derived from the Latin 'notitia', meaning 'a being known'.

'Sporadicus' transformed into the English word 'sporadic', and 'notitia' evolved into 'notice', eventually forming the compound adjective 'sporadically-noticed'.

Initially, 'sporadic' meant 'scattered or isolated', and 'notice' meant 'to observe or become aware of'. Together, they convey the idea of being observed at irregular intervals.