This is the 5882nd most frequent Japanese word.
まざまざ
Clearly; vividly; unmistakably.
Here, まざまざ is used to express a vivid realization or feeling of something impactful or intense.
事故の恐ろしさをまざまざと感じました。
I vividly felt the terror of the accident.
In this sentence, まざまざ emphasizes the clear and undeniable demonstration of someone's abilities.
彼の才能をまざまざと見せつけられた。
His talent was vividly displayed to me.
Here, まざまざ is used to convey the striking and impactful perception of one's flaws.