English
frustrately
From frustrate + -ly.
Formed from frustrate + -ly
Latin frūstrā ‘in deception, in error’
Latin frustror ‘to deceive’
Latin frūstrātus ‘deceived’
Middle English frustraten ‘to prevent, disappoint, render useless’
English frustrate
Today it means
adv in vain
Language periods are conventional ranges, not dates for this word.
Etymograph / frustrately