witless vs senseless

witless and senseless both are adjectives.

Word	Noun	Adjective	Verb	Adverb
witless	No	Yes	No	No
senseless	No	Yes	No	No

As adjectives, witless and senseless are synonyms defined as:

witless and senseless: (of especially persons) lacking sense or understanding or judgment

Other synonyms of witless include nitwitted, soft-witted.

witless (adjective)	senseless (adjective)
(used as complement) to the utmost degree	(of especially persons) lacking sense or understanding or judgment
(of especially persons) lacking sense or understanding or judgment	unresponsive to stimulation
	not marked by the use of reason
	serving no useful purpose; having no excuse for being