the modern informal adjective 'sucky' is a relatively recent formation in english, emerging in the late 20th century. it is built upon the verb 'suck', which has a long history tracing back to proto-germanic 'sūkan-' and old english 'sūcan', with the core meaning of drawing liquid. in mid-20th century american slang, 'suck' developed a figurative sense meaning to be highly disagreeable, inferior, or disappointing. the productive adjective-forming suffix '-y', of ancient germanic origin, was then appended to this slang base. the resulting word 'sucky' literally means 'characterized by sucking', but its abstract meaning is entirely derived from the modern pejorative sense of the root, denoting something of poor quality.

Structure: suck (to be very bad) + y (adjective-forming suffix) suck (from middle english 'souken', old english 'sūcan', of germanic origin, meaning to draw liquid into the mouth; later developing a slang sense meaning to be very bad or unpleasant). y (from middle english '-y', '-i', from old english '-ig', of germanic origin, a suffix forming adjectives meaning 'characterized by; full of; inclined to').