1 blind

2 groundlessly

3 foolishly

4 to no purpose

1 blind person

1 to talk irresponsibly

2 to talk nonsense

1 to be blind

1 to wander aimlessly

1 to be deaf and blind (idiom)

1 to lie through one's teeth (idiom)

2 to talk drivel

1 to lie through one's teeth (idiom)

2 to talk drivel

1 blind people touch an elephant (idiom, from Nirvana sutra 大般涅槃經|大般涅盘经[dà bān Niè pán jīng]); fig. unable to see the big picture

2 to mistake the part for the whole

3 unable to see the wood for the trees

1 a blind cat finds a dead mouse (idiom)

2 blind luck