適 suitable

My TEKI (enemy) is suitable for poking or slapping.

Yosemite Sam is very suitable for the mud-flaps of a moving vehicle.

appropriate ★★★★☆ JERK
適 (suitable) + 当 (hit the target) = 適当 (appropriate)

appropriate, as in an appropriate gift. However, 適当　also means irresponsible! Doing something without considering the consequences. 適当な人間だ！ “He's irresponsible. He'll say anything that pops into his head.”

a marriageable age ☆☆☆☆☆
適 (suitable) + 齢 (stage of life) + 期 (period of time) = 適齢期 (a marriageable age)