Definition of "tactless" [tact•less]

• Lacking or exhibiting a lack of tact; bluntly inconsiderate or indiscreet. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "I haven't found out what the trouble is, but I know you must have sinned against the girl in some way, or done something tactless, which is worse, and made her angry."
• "Herr Sydney here and myself, surely it was 'tactless' of them?"
• "A spokeswoman for the department told Ekho Moskvy radio that it was "tactless" of the publisher to use the department's name for the calendar, but that the students would face no punishment."