Unrepresentative (adjective)

1. Not typical or characteristic of a particular group or phenomenon.
2. Not giving a fair or accurate representation.

Origin:

From the latin word 'inrepresentativus' meaning 'not typical or characteristic'.

Examples:

1. The sample was unrepresentative and did not reflect the true population.
2. The results were unrepresentative of the true feelings of the voters.
3. The group of participants was unrepresentative of the diversity of the community.
4. The data was unrepresentative and biased due to selection methods.
5. The survey was unrepresentative of the opinions of the elderly population.