unreliable
CEFR: B2
Not able to be relied upon; erratic, inconsistent in performance, and prone to sudden failure or untruthfulness.
Synonyms
- erratic
- capricious
- undependable
Common Collocations
- unreliable data
- unreliable narrator
- notoriously unreliable
Example Sentence
Self-reported dietary questionnaires are notoriously unreliable due to recall bias and underreporting among participants.