weakish
Not quite feeble
Somewhat weak; slightly lacking in strength, intensity, or conviction.
The suffix -ish softens the judgment: The coffee was weakish, but drinkable.
A weakish argument isn't entirely unconvincing, just not particularly strong.
The word sees limited use, as "a bit weak" or "fairly weak" serve the same purpose.
Tending to teeter
- shakyTrembling or unstable
- totteringMoving unsteadily, nearly falling
- swayingRhythmic lateral movement
- staggeringShockingly impressive or unsteady
trembling · teetering · faltering · unstable · quivering · wavering · unbalanced · precarious
wobbly
Tending to teeter
- shakyTrembling or unstable
- totteringMoving unsteadily, nearly falling
- swayingRhythmic lateral movement
staggering · trembling · teetering · faltering · unstable · quivering · wavering · unbalanced · precarious · rickety
frail
Weak and breakable
- infirmWeak in body
- debilitatedMade weak or infirm
- enervatedDepleted of vitality
faint · wan · pallid · languid · anemic · sapped · enfeebled · flagging · limp · drooping
gentle
Soft and kind
- moderateLessen intensity or preside
- lightVisible electromagnetic radiation
- subtleNot immediately obvious
soft · slight · tepid · diluted · watered-down · thin · bland · insipid · tame · understated