Cambridge Dictionary:

1. having little money and/or few possessions 2. to have very little of a particular substance or quality

Google:

1. lacking sufficient money to live at a standard considered comfortable or normal in a society 2. of a low or inferior standard or quality

Dictionary.com:

1.having little or no money, goods, or other means of support: a poor family living on welfare. 2. Law. dependent upon charity or public support. 3.(of a country, institution, etc.) meagerly supplied or endowed with resources or funds. 4. characterized by or showing poverty. 5. deficient or lacking in something specified

Oxford Dictionary:

1. Lacking sufficient money to live at a standard considered comfortable or normal in a society. 2. Of a low or inferior standard or quality. 3. [attributive] (of a person) deserving of pity or sympathy.

Having too little of quantity of something (money) to do X (go out, renovate, travel, etc).