different between shelled vs unshelled

English

shelled

shelled (not comparable)

(often in combination) Having a shell; testaceous.
Having had the shell removed.
Synonym: deshelled
(cycling, slang) Unable to keep up in a race, having used up one's reserves of energy.

un- +? shelled

unshelled (not comparable)

Not having had the shell removed.
Not bombarded with military shells.
- 2013, Spencer C. Tucker, The European Powers in the First World War: An Encyclopedia
  After intelligence indicated that the Germans were using the unshelled route almost exclusively, Uniacke would quickly shift all his guns there, with disastrous effects for the Germans.

See the etymology of the main entry.

unshelled

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