Not able to be trusted or depended on due to inconsistency, irresponsibility, or unreliability.

Not able to be trusted or depended on, prone to sudden changes or failures, posing a risk or threat due to inconsistency or unpredictability.

Not dependable or trustworthy; prone to failing to fulfill expectations or obligations.

Not able to be trusted or depended on, likely to give incorrect information or fail to fulfill obligations.