different between dallying vs whimsy

English

dallying

dallying (plural dallyings)

dalliance
- 1902, J. M. Barrie, s:The Little White Bird
  Nevertheless, you must know (if I am to speak honestly to you) that I do not repent me those dallyings in enchanted fields.

Probably from whims +? -y. Related to whim-wham, whim.

whimsy (usually uncountable, plural whimsies)

A quaint and fanciful idea; a whim; playfully odd behaviour.
An impulsive, illogical or capricious character.
(mining) A whim (capstan or vertical drum).
A jigsaw puzzle piece that has been cut into a recognizable shape, as if on a whim; often the shape is representative of the theme of the image used for the puzzle.

whimsy (third-person singular simple present whimsies, present participle whimsying, simple past and past participle whimsied)

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