undeliverability en · NOUN
Etymology
From un- + deliver + -ability or undeliverable + -ity.
Meanings
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(uncountable) The state or quality of being undeliverable.
Response rate was limited due in part by^([sic]) the undeliverability of a large portion of the surveys (approximately 50%) and to respondents' attrition from the firm in question.
2007, Angela Kay Lawson, Having Your Day in Court, page 25: