frus·trat·ing 
/ˈfrʌˌstreɪtɪŋ/ adjective
/ˈfrʌˌstreɪtɪŋ/ adjective [more frustrating; most frustrating] : causing feelings of anger and annoyance
▪ All these delays have been very frustrating.
▪ All these delays have been very frustrating.
— frus·trat·ing·ly adverb
▪ frustratingly long delays
▪ frustratingly long delays
