Tinniest

adjective

1. Of or pertaining to or resembling tin.

   "The object had a tinny appearance."

2. 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."

3. 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."