Similar meaning, but more modern:
* Awesome: A more general term for something great or impressive.
* Rad: Similar to "awesome," but with a slightly more informal and energetic feel.
* Cool: A classic term for something good or impressive, but can also mean "calm" or "relaxed."
* Dope: Often used for something that is excellent or impressive, especially in music, fashion, or art.
* Sick: A more recent slang term meaning great, impressive, or cool.
More specific meaning, depending on the context:
* Far out: Similar to "groovy" in its psychedelic connotations, but implies something strange or unusual.
* Sweet: Can mean "nice" or "good," but also implies something appealing or desirable.
* Tight: Often used for something that is well-done or impressive, especially in terms of skill or style.
The best choice will depend on the specific situation and the intended meaning.