Intensity in Chinese / Japanese...

強烈 means intensity in regard to strength.

Note: In some contexts, this can mean violently strong or severe.

大胆不敵 is a Japanese word that can mean a few things depending on how you read it.

Popular translations include fearless, audacity (the attitude of a) daredevil, or daring.

The first two Kanji create a word that means: bold, fearless, or daring; audacious.

The last two Kanji create a word meaning: no match for, cannot beat, daring, fearless, intrepid, bold, or tough.

As with many Japanese words, the two similar-meaning words work together to multiply the meaning and intensity of the whole 4-Kanji word.

迫力 is a Chinese word that is a form of personal strength.

It is a word that describes a person who is willing to take a risk. In English, we might say, “Someone with guts.”

An example might be a person that is not rich but invests a lot of money into something (knowing they could double their money or lose it all). Win or lose, this is a person that knows or pushes their potential.

Tearing this word apart, the first character means “to compel,” urgent, urge, force, imminent, or “spur on.” The second means power, strong, bear, or exert.

Note: 迫力 is also a word in Japanese Kanji and Korean Hanja but with a meaning more like force, intensity, appeal, strength, impact, force, or simply power.