tactless vs untactful

tactless and untactful both are adjectives.

Word	Noun	Adjective	Verb	Adverb
tactless	No	Yes	No	No
untactful	No	Yes	No	No

As adjectives, tactless and untactful are synonyms defined as:

tactless and untactful: lacking or showing a lack of what is fitting and considerate in dealing with others

tactless (adjective)	untactful (adjective)
lacking or showing a lack of what is fitting and considerate in dealing with others	lacking or showing a lack of what is fitting and considerate in dealing with others
revealing lack of perceptiveness or judgment or finesse