Jejune and Sapless

Jejune adjective - Causing weariness, restlessness, or lack of interest.

Sapless and jejune are semantically related In some cases you can use "Sapless" instead an adjective "Jejune".

Sapless adjective - Destitute of sap and other vital juices; dry.

Jejune and sapless are semantically related in bland topic. Sometimes you can use "Jejune" instead an adjective "Sapless", if it concerns topics such as dull, harmless.