Unscientific (adjective)

1. Not based on scientific knowledge or methodology.
2. Lacking a systematic and logical approach.

Origin:

From the latin word 'inscientia' meaning 'ignorance'.

Examples:

1. The unscientific theory was quickly proven to be false.
2. The unscientific experiment was flawed from the start.
3. The unscientific approach to solving the problem was unreliable.
4. The unscientific method of treatment had no proven success.
5. The unscientific beliefs were not supported by evidence.