different between wailful vs rueful

English

From wail +? -ful.

wailful (comparative more wailful, superlative most wailful)

(chiefly poetic) Sorrowful; mournful.
- 1590, Edmund Spenser, The Faerie Queene, III.4:
  Farre better I it deeme to die with speed / Then waste in woe and waylfull miserye […]
- c. 1591, William Shakespeare, The Two Gentlemen of Verona, First Folio 1623:
  You must lay Lime, to tangle her desires / By walefull Sonnets, whose composed Rimes / Should be full fraught with seruiceable vowes.

From Middle English ruful, rewful; equivalent to rue +? -ful.

rueful (comparative more rueful, superlative most rueful)

Causing, feeling, or expressing regret or sorrow, especially in a wry or humorous way.
Inspiring pity or compassion.
Bad; woeful; deplorable.

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