Waif in a sentence as a noun

He could be a four foot tall waif and I wouldn't think any differently of the field.

In action movies she will be a 100 pound waif who is capable of knocking out 250lb men with a few kicks.

Furthermore, your apparent belief that a "starving waif in some developing country" is at a high risk for malnutrition-induced immunodeficiency is outrageous.

This case, though, does illustrate that Android remains the waif child of the mobile device industry, the one who gets periodic beatings, whether from Apple, Oracle, Microsoft, or any other entrenched proprietary player, with software patents often serving as the whip.

Waif definitions

noun

a homeless child especially one forsaken or orphaned; "street children beg or steal in order to survive"