tinny /ˈtɪni/ adjective3 •Of or pertaining to or resembling tin.The object had a tinny appearance. •Pertaining to a thin, unpleasant sound recalling that of tin being rapped.The piano was not simply out of tune, but had become downright tinny. •Pertaining to the thinness and cheapness of tin or similar-looking metals, in contrast to a heavier, more valuable metal.The shop was filled with tinny tourist geegaws. formstinnies · more tinny · tinnier · most tinny · tinniest