単に
たんに · tanni · JLPT N3 · adverb
simply
単 (single, simple) + に (adverb ending) = singly, i.e. simply; merely
単 means single or simple, as in 単語 (word) and 簡単 (easy). Add に and it becomes an adverb: done in one simple way, nothing more. Sound hook: tanni sounds like tiny, so it's merely a tiny matter.