1) Debile 2) Decrepit 3) Devoid of juice 4) Feeble 5) Frail 6) Infirm 7) Like a dry maple 8) Like a Mensa convention 9) Weak 10) Weakly 11) Without vitality 1) Debile 2) Frail 3) Juiceless 4) Sere 5) Weakly 
• (a.) Destitute of sap; not juicy. • (a.) Fig.: Dry; old; husky; withered; spiritless.
Sap'less adjective 1. Destitute of sap; not juicy. 2. Fig.: Dry; old; husky; withered; spiritless. 'A somewhat sapless womanhood.' Lowell. « Now sapless on the verge of death he stands.» Dryden. 
[adj] - destitute of sap and other vital juices
adjective destitute of sap and other vital juices; dry; `the rats and roaches scurrying along the sapless planks`- Norman Mailer