sallow

Short definition from Wiktionary

Adjective

1. 1
   Yellowish: Of a sickly pale colour.
2. 2
   Yellowish: Of a tan colour, associated with people from southern Europe or East Asia.
3. 3
   Having skin (especially on the face) of a sickly pale colour.
4. 4
   Having a similar pale, yellowish colour.
5. 5
   Foul; murky; sickly.

Verb

1. 1
   To become sallow.
2. 2
   To cause (someone or something) to become sallow.

Noun

1. 1
   A European willow, Salix caprea, that has broad leaves, large catkins and tough wood.
2. 2
   A willow twig or branch.