Knackered and Sapless

Knackered adjective - Depleted in strength, energy, or freshness.

Sapless and knackered are semantically related. In some cases you can replace term "Sapless" with "Knackered", this adjectives are similar.

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

Knackered and sapless are semantically related. Sometimes you can use "Knackered" instead an adjective "Sapless".