In extended use, of a thing: that appears to be alive; that acts or moves as if alive; animated (cf. lively, adj. 1b); spec. (a) (of water)…

Of water: clean, pure; (of another liquid) clear, not cloudy. Formerly also of colour: †bright, pure, not dull or muddy (obsolete).

Not mixed or adulterated; clean, clear, refined; spec. (a) not mixed with any other substance or material; free from admixture or adulteration…

Allowing light to pass through, transparent.

Of water: Pure, clear.

Resembling or suggestive of crystal; clear, pure; bright, shining, infused with light; (of water) transparent, unclouded. Also figurative…

Translucent; lucid, clear.