Lilliputian
/ˌlɪlɪˈpjuːʃn/
Definition 1 of 2
Pro Tip 1/3Originally Literary
Originates from 'Gulliver's Travels,' implying something tiny, like the fictional Lilliputians. 
His lilliputian efforts were comical, as though he were a character out of a storybook.
Pro Tip 2/3Beyond Physical Size
Can describe something of minor importance or influence, not just small in size. 
In the corporate debate, her lilliputian voice was barely heard above the din.
Pro Tip 3/3Sometimes Pejorative
May imply that small size is a negative trait or a limitation. 
The executives dismissed the lilliputian startup as no competition.