'intranquilidad' originates from Spanish, specifically the word 'intranquilidad', where the prefix 'in-' meant 'not' and the root 'tranquilidad' derived from Latin 'tranquillitas' (from 'tranquillus' meaning 'calm').

'intranquilidad' changed from Old Spanish forms such as 'intranquilidat', influenced by Latin 'tranquillitas', and eventually became the modern Spanish 'intranquilidad'.

Initially it meant 'absence of calm' (literally 'not calmness'), and over time it evolved into its current usage referring to 'restlessness, unease, or anxiety'.