Definition of tactless adjective from the Oxford Advanced Learner's Dictionary

 

tactless

 adjective
adjective
BrE BrE//ˈtæktləs//
 
; NAmE NAmE//ˈtæktləs//
 
 
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saying or doing things that are likely to annoy or to upset other people synonym insensitive a tactless remark It was tactless of you to comment on his hair! opposite tactfulExtra examples It had been tactless of her to mention it. It was so obviously a tactless question. Lewis could be brash and a bit tactless at times.
See the Oxford Advanced American Dictionary entry: tactless