Refers to mental derangement or a state of being crazy. Can be used literally or figuratively.
irregularity; deviation; disorder
Used for something being out of order, not functioning correctly, or deviating from the norm. Common in mechanical or systematic contexts.
Used as a suffix (often voiced to ぐるい) to indicate an obsessive enthusiast or fanatic. The standalone noun use is rare.
This clock has developed a slight inaccuracy.
There is a touch of madness in his behavior.
That's sheer madness.
The clock has developed an irregularity.
A deviation occurred in the plan.
He is a fishing fanatic.
That person is a game nut, playing until late every night.
I had the irregularity in the engine fixed.
He's a workaholic; he's even at the office on his days off.
誤差 is the precise technical term for a measurement error, while 狂い is a broader, everyday word for anything being off or out of order.
insanity; madness; an insane person
off-season flowering; unseasonal blooming
woman-crazy; obsessed with a woman; losing one's head over a woman
off-season flowering
man-crazy; nymphomania; wantonness
Noun form of the verb 狂う (くるう, 'to go mad, to be out of order'). The suffix use with rendaku (ぐるい) developed from the idea of being 'crazy about' something.