Meanings

rash

lightly

thoughtless

easy

slight

light motor vehicle (up to 660cc and 64bhp)

lightness and heaviness

loose-lipped

common foot soldier (feudal Japan)

light alloy

hasty act

small, light and thin (of consumer products, esp. electronics)

gullibility

acrobat

light boat

nimble

light bomber

on the light side (weight)

fickle

carefree