convalescent (adj.)

"recovering strength and health after sickness," 1650s, from French convalescent, from Latin convalescentem (nominative convalescens), present participle of convalescere "thrive, regain health, begin to grow strong or well," from assimilated form of com-, here perhaps an intensive prefix (see com-), + valescere "to begin to grow strong," inchoative of valere "to be strong" (from PIE root *wal- "to be strong").

As a noun, "one who is recovering strength and health after sickness or debility," attested from 1758.

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Definitions of convalescent from WordNet
convalescent (n.)
a person who is recovering from illness;
convalescent (adj.)
returning to health after illness or debility;
convalescent children are difficult to keep in bed
Synonyms: recovering