slight

not in any way not in the least The whole stupid argument didn't interest me in the slightest.

Also, in the slightest. At all, in the smallest degree. These terms are nearly always used in a negative context. For example, I don't care in the least what you do with the money, or It doesn't matter in the slightest whether or not you attend. [c. 1600] They may also be put as not in the least or not in the slightest, as in I am not in the least worried about the outcome, or The heat doesn't bother me in the slightest. In the least dates from about 1600; in the slightest has been used in the sense of "emphatically unimportant or trifling" since the late 1500s.

At all: I don't mind in the least.