Of hair: Not formed into, or growing in, curls or ringlets; out of curl.

Awkwardly or ungracefully lean and long. †Also (of hair) somewhat lank (obsolete).

somewhat lank.

Of hair: Without curl or wave, straight and flat.

Of hair: Not curly or waved.

(also attributive)

(un-, prefix2 affix 2.)

(un-, prefix1 affix 4.)

Without curls.