imprudence; indiscretion; thoughtlessness
shallow view; superficial idea
shallow knowledge; superficial learning
depth; shade (of color, colour)
one's lack of learning or ability; shallow learning and limited ability
shallow and unwise; superficial and thoughtless
incompetence; lack of ability
getting slightly intoxicated and humming a tune
shallow learning and limited information; being ignorant and badly informed
nine shallow, one deep (ancient Chinese sexual technique)
shallow earthquake; shallow-focus earthquake