탄탄해요 · 탄탄했어요 · 탄탄한 (+noun)
firm, solid, sturdy; well-built
Example
그 회사는 기술력이 탄탄해서 믿을 수 있어요.
That company has solid technology, so you can trust it.
Word parts
Doubled syllable for firmness; used for muscles, stories and businesses alike.
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