Poor describes having little of something. If you lack needed food and shelter, you're poor, and if you fall below a standard or don't even try, you're giving a poor performance. Empty pockets and empty efforts both mean poor.

Rich or wealthy often serve as opposites of poor. If you have material things, you're rich, and if you don't, you're poor. You can be full of knowledge but get poor grades if you're not studying, or you might be poor in terms of money but rich in friends and kindness. Poor can also be used as a noun, as in "Charity is aimed at helping the poor."

Definitions of poor
  1. adjective
    having little money or few possessions
    “deplored the gap between rich and poor countries”
    “the proverbial poor artist living in a garret”
    lacking the rights and advantages of other members of society
    broke, bust, skint, stone-broke, stony-broke
    lacking funds
    destitute, impoverished, indigent, necessitous, needy, poverty-stricken
    poor enough to need help from others
    hard up, impecunious, in straitened circumstances, penniless, penurious, pinched
    not having enough money to pay for necessities
    having no money
    unprovided for
    without income or means
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    possessing material wealth
    present in great quantity
    blessed with privileges
    affluent, flush, loaded, moneyed, wealthy
    having an abundant supply of money or possessions of value
    comfortable, easy, prosperous, well-fixed, well-heeled, well-off, well-situated, well-to-do
    in fortunate circumstances financially; moderately rich
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  2. adjective
    characterized by or indicating poverty
    “the country had a poor economy”
    “they lived in the poor section of town”
    beggarly, mean
    marked by poverty befitting a beggar
    (of housing or residential areas) indicative of poverty
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    suggestive of or characterized by great expense
    deluxe, gilded, grand, luxurious, opulent, princely, sumptuous
    rich and superior in quality
    extravagant, lavish, lucullan, lush, plush, plushy
    characterized by extravagance and profusion
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  3. adjective
    lacking in specific resources, qualities or substances
    “a poor land”
    “the area was poor in timber and coal”
    “food poor in nutritive value”
    lacking or deficient in natural resources
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    having an abundant supply of desirable qualities or substances (especially natural resources)
  4. adjective
    not sufficient to meet a need
    “a poor salary”
    synonyms: inadequate, short
    deficient, insufficient
    of a quantity not able to fulfill a need or requirement
  5. adjective
    “a poor light for reading”
    poor morale”
    “expectations were poor
    having undesirable or negative qualities
  6. noun
    people without possessions or wealth (considered as a group)
    “the urban poor need assistance”
    synonyms: poor people
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    rich, rich people
    people who have possessions and wealth (considered as a group)
    poor people who unfortunately do not have a home to live in
    needy people collectively
    type of:
    (plural) any group of human beings (men or women or children) collectively
  7. adjective
    deserving or inciting pity
    “Oh, you poor thing”
    “his poor distorted limbs”
    synonyms: hapless, miserable, misfortunate, pathetic, piteous, pitiable, pitiful, wretched
    not favored by fortune; marked or accompanied by or resulting in ill fortune
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