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still; much more; (not) yet
still a long way to go; still a long way off; not there yet
日本語の勉強はまだまだ足りない。
My Japanese study is still far from enough.
まだまだ暑い日が続きそうだ。
It seems like hot days will continue for a while.
実力はまだまだだが諦めずに頑張る。
My skills are still lacking, but I'll keep trying without giving up.