Lesser and Undersized

Lesser adjective - Having not so great importance or rank as another.

Undersized and lesser are semantically related. in inferior topic. In some cases you can use "Undersized" instead an adjective "Lesser".

Undersized adjective - Of a size that is less than average.

Lesser and undersized are semantically related. Sometimes you can replace term "Lesser" with "Undersized", this adjectives are similar.