flimsy:
heavy,
substantial,
efficient,
solid,
tough,
reasonable,
plausible,
able,
sturdy,
serious,
convincing,
strong,
firm,
thick.
lame:
capable,
agile, Uncrippled,
mobile,
walking,
satisfactory.
thin:
fat,
undiluted,
intelligent,
dense,
full,
concentrated,
adequate,
obese,
inflated,
sufficient.