senseless vs witless

senseless and witless both are adjectives.

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

As adjectives, senseless and witless are synonyms defined as:

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

Other synonyms of senseless include nitwitted, soft-witted.

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