• 敢あえて — to do something deliberately or bravely, even when it’s risky
• 勇敢ゆうかん — brave; courageous; showing valor
• 敢行かんこう — carrying out a plan boldly; taking decisive action
• 敢然かんぜん — boldly; resolutely; with firm courage
• 敢闘かんとう — fighting bravely; showing determined effort in a struggle
• 果敢かかん — daring and decisive; acting without hesitation

敢 is a phono-semantic character. On the right is a phonetic element that gives the sound カン, and on the left we have the action radical 攵（のぶん）, which often appears in kanji about striking, acting, or doing something. Together they suggest taking action on purpose — not by accident or impulse, but by a conscious, bold decision. That is the nuance behind words like 敢行 and 敢然.