underweight

/AH1 N D ER0 W EY0 T/
noun
  1. 1

    The state or quality of being underweight.

  2. 2

    An underweight person.

verb
  1. 1

    To underestimate the weight of.

  2. 2

    To give insufficient weight to (a consideration); to underestimate the importance of.

adjective
  1. 1

    Of an inappropriately or unusually low weight.

    โ€œHe's so underweight he's had to buy smaller clothes.โ€

  2. 2

    Not too heavy for an intended purpose.

    โ€œThe suitcase is just slightly underweight; I'll let it on the plane.โ€

  3. 3

    Being less invested in a particular area than market wisdom suggests.

    โ€œThe fund is underweight in mining.โ€

Source: https://en.wiktionary.org/wiki/underweight