'reliably-equipped' is a compound formed from 'reliably' and 'equipped.' 'Reliably' comes from 'reliable,' which is from 'rely' + '-able,' and 'equipped' is the past participle of 'equip,' from French 'équiper.'

'reliable' developed in the 16th century from 'rely' and '-able.' 'Equip' entered English from French in the 16th century. The compound 'reliably-equipped' is a modern English formation.

Initially, 'equip' meant 'to fit out or furnish,' and 'reliable' meant 'that can be relied on.' The compound now means 'having equipment in a dependable way.'