shaky

shaky
shak‧y /ˈʃeɪki/ adjective1. weak and unsteady because of old age, illness, or shock:
    a shaky voice
    Grandad was a little shaky on his feet (=not able to walk very well).
2. not sure about the exact details of something, or not likely to be completely right:
    My knowledge of history is a little shaky.
    shaky evidence
3. not firm or steady
   SYN  unstable:
    shaky foundations
—shakily adverb
—shakiness noun [uncountable]
     

THESAURUS

■ not physically strong
   ▪ weak not physically strong, sometimes because you are ill: Tom’s had flu and he’s still feeling weak. | The doctors said she was too weak to have an operation. | He suffered constantly from a weak chest.
   ▪ frail weak and thin, especially because you are old: a frail 85-year-old lady | My grandfather’s becoming quite frail now.
   ▪ shaky feeling weak in your legs and only able to walk slowly and unsteadily: When I came out of hospital I was a bit shaky for a while.
   ▪ puny /ˈpjuːni/ especially disapproving small, thin, and looking very weak: his puny white arms | He was a puny little boy who was often bullied at school.
   ▪ feeble especially written weak and unable to do much because you are very ill, very old or young: For a week she was too feeble to get out of bed. | a tiny, feeble baby
   ▪ delicate weak and often becoming ill easily: a delicate child | She had rather a delicate constitution (=her body easily became ill).
   ▪ infirm formal weak or ill for a long time, especially because you are old: a residential home for people who are elderly and infirm | There are special facilities for wheelchair users and infirm guests.
   ▪ malnourished formal weak or ill because you have not had enough good food to eat: Half a million people there are severely malnourished. | The organization provides emergency feeding for malnourished children.