1 flat

2 dull

3 ordinary

4 nothing special

1 clear

2 obvious

3 unequivocal

4 to understand

5 to realize

1 insipid

2 diluted

3 weak

4 mild

5 light in color

6 tasteless

7 indifferent

8 (variant of 氮[dàn]) nitrogen

1 calm and collected

2 unperturbed

1 faint

2 dim

3 dull

4 insipid

5 unenthusiastic

6 indifferent

1 perfectly clean

2 blameless

3 unimpeachable (idiom)

1 not distinguishing black or white (idiom); not to distinguish between right and wrong

1 not distinguishing red-green or black-white (idiom)

2 not to distinguish between right and wrong

1 not distinguishing red-green or black-white (idiom)

2 not to distinguish between right and wrong

1 lose a wheel, tear at the gun (idiom); flustered and confused in a panic