Synonyms for Lilliputian (same or very similar meaning)
WordNet sense 1 (very small):
bantam, diminutive, flyspeck, midget, tinyWordNet sense 2 (limited or below average in number or quantity or magnitude or extent):
little, smallWordNet sense 3 ((informal) small and of little importance):
niggling, petty, picayune, piddling, piffling, trivial, fiddling, footlingWordNet sense 4 (not important):
unimportantFrom the ODE community, based on WordNetadd/edit