'tideless' originates from the word 'tide' combined with the suffix '-less', where 'tide' refers to the periodic rise and fall of sea levels, and '-less' indicates absence.

'tideless' evolved from the Old English word 'tīd', meaning 'time' or 'tide', combined with the suffix '-less', indicating absence.

Initially, it referred to the absence of tides, and this meaning has largely remained the same in modern usage.