to a fault

Adverb

 * 1)  To an excessive degree; extremely; counterproductively.
 * I am trusting to a fault.
 * 1) * 1710, Issac Norris, Friendly Advice to the Inhabitants of Pensilvania, Andrew Bradford (Philadelphia), p. 2,
 * He also had that good qualification, of a moderate expectation, almost to a fault.
 * 1) * 1883, Mark Twain, Life on the Mississippi, ch. 34 "Tough Yarns,"
 * These mosquitoes . . . are feeble, insignificant in size, diffident to a fault.
 * These mosquitoes . . . are feeble, insignificant in size, diffident to a fault.

Usage notes
"To a fault" is ordinarily used to modify an adjective which describes some desirable or otherwise positive characteristic of a person. Sometimes the expression functions as a strong intensifier, meaning "extremely." Often, however, the expression is used to indicate that the person possesses or exhibits that characteristic in a measure which can reasonably be regarded as disproportionate, unwise, over the top, counterproductive, or annoying.

Translations

 * Finnish: liiaksi asti
 * French:
 * Hungarian: túlzottan/túlságosan (is),