frustratingly Definition

frustrate
verb frustrated, frustrating

1. To prevent someone from doing or getting something; to thwart or foil (a plan, attempt, etc).

Thesaurus: impede, stall, circumvent, neutralize, nullify, countermine, inhibit, block, check, forestall, baffle, stymie, defeat, foil; Antonym: fulfil, abet, further, promote.
2. To make (someone) feel disappointed, useless, lacking a purpose in life, etc.

Thesaurus: disappoint, discourage, dishearten, let down; Antonym: encourage.

Derivative: frustrating
adj

Derivative: frustratingly
adverb

Etymology: 15c: from Latin frustrari, frustratus to deceive or disappoint.