wide vs wide of the mark

wide and wide of the mark both are adjectives.

Word	Noun	Adjective	Verb	Adverb
wide	No	Yes	No	Yes
wide of the mark	No	Yes	No	No

As adjectives, wide and wide of the mark are synonyms defined as:

wide (adjective)	wide of the mark (adjective)
having great (or a certain) extent from one side to the other	not on target
great in degree
having ample fabric
broad in scope or content
not on target
very large in expanse or scope
(used of eyes) fully open or extended

wide (adverb)	wide of the mark (adverb)
to or over a great extent or range; far
with or by a broad space
far from the intended target
to the fullest extent possible