synonym for thoughtless; thinkless is usually used by
one or more drunken person(s) when words, especially of the
compound nature become hard to transfer from brain to mouth.
Most often times it is used as an insult, usually setting the user of the word up for insults him/herself.
"You are so thinkless!"
"You thinkless bitch
may be found in use on y o u tube
under the second video option
if you type in "crazy bitch fight".