'stamineless' originates from English, formed by combining the noun 'stamina' and the suffix '-less', where 'stamina' meant 'vital strength, endurance' and '-less' meant 'without'.

'stamina' originates from Latin 'stamen' (plural 'stamina'), where 'stamen' originally meant 'warp, thread'; in English (from the 18th century) 'stamina' came to mean 'vital strength' or 'endurance'. The modern adjective 'stamineless' was formed in English by adding the productive suffix '-less' to 'stamina'.

Initially, 'stamina' in Latin referred to 'warp' or 'thread' and only later gained the figurative sense 'vital strength' in English; 'stamineless' has meant 'without stamina' since it was formed and retains that basic meaning of 'lacking endurance or energy'.