Here’s an expert example of negation + ‘in the least’:

I’m **not in the least** bit religious.

**C2** Point 28 in the category of NEGATION is defined:

‘IN THE LEAST’ after a negative form for emphasis.

A search in iWeb:

1 NOT SURPRISED IN THE LEAST 86

2 NOT BE IN THE LEAST 63

3 N’T MATTER IN THE LEAST 49

4 NOT MATTER IN THE LEAST 48

5 NOT SURPRISING IN THE LEAST 47

6 NOT DISAPPOINTED IN THE LEAST 40

7 N’T MIND IN THE LEAST 35

8 N’T CARE IN THE LEAST 33

9 NOT CARE IN THE LEAST 30

10 N’T BE IN THE LEAST 28

11 NOT WORRIED IN THE LEAST 28

12 NOT , IN THE LEAST 24

13 NOT MIND IN THE LEAST 20

14 NOT EXAGGERATING IN THE LEAST 19

15 NOT HESITATE IN THE LEAST 19

16 NOT SEEM IN THE LEAST 18

17 NOT BOTHERED IN THE LEAST 17

18 NOT CONCERNED IN THE LEAST 16

19 NOT OFFENDED IN THE LEAST 15

20 NOT AFFECTED IN THE LEAST 13

1 NOT IN THE LEAST BIT 652

2 NOT IN THE LEAST . 469

3 NOT IN THE LEAST , 141

4 NOT IN THE LEAST BECAUSE 120

5 NOT IN THE LEAST SURPRISED 85

6 N’T IN THE LEAST BIT 77

7 NOT IN THE LEAST INTERESTED 63

8 NOT IN THE LEAST TO 58

9 NOT IN THE LEAST CONCERNED 52

10 NOT IN THE LEAST ! 41

B1:

disappointed, seem, surprising

B2:

affected, concerned, hesitate, offended

C1:

exaggerating