niggling

(informal) small and of little importance

• “a fiddling sum of money”
• “a footling gesture”
• “our worries are lilliputian compared with those of countries that are at war”
• “a little (or small) matter”
• “a dispute over niggling details”
• “limited to petty enterprises”
• “piffling efforts”
• “giving a police officer a free meal may be against the law, but it seems to be a picayune infraction”