実に
じつに · jitsuni · JLPT N3 · adverb
truly
🍎 実 (fruit, substance) + に = in substance: indeed, truly
実 means fruit, and by extension real substance or truth, as in 事実 (fact) and 実際 (actuality). Adding the particle に turns it into an adverb: in real substance, so truly or indeed. It has a slightly formal, emphatic tone.