underweight

adjective

1. weighing less than is usual, required, or proper.

noun

2. deficiency in weight below a standard or requirement.

adjective

1. weighing less than is average, expected, or healthy
2. finance
   1. having a lower proportion of one’s investments in a particular sector of the market than the size of that sector relative to the total market would suggest
   2. (of a fund etc) disproportionately invested in this waypension funds have become underweight of equities

adj.1899, from under- + weight. adj.

1. Weighing less than is normal, healthy, or required.

n.

1. Insufficiency of weight.