The term 'really slow' can be described by two crossword solutions: 'POKY' (4 letters) and 'GLACIAL' (7 letters). 'POKY' is an informal adjective meaning 'slow-moving or sluggish'. It is derived from the Middle English word 'POKE', which means 'bag or pouch'. 'GLACIAL' is an adjective meaning 'very slow or sluggish'. It is derived from the Latin word 'glacies', which means 'ICE'. Therefore, both words describe something that moves very slowly.