The term "wacky" is an adjective that describes something or someone as being unusual, unconventional, and often humorous. It can be used to describe a person with an eccentric or zany personality, or it can refer to something bizarre or outlandish in nature. The word has a lighthearted connotation, suggesting that while the thing or person being described may be unusual, there is no harm and perhaps even some amusement had unionality.