The term 'not abundant' can be described by the crossword solutions THIN (4 letters), RARE (4 letters), SCARCE (6 letters), SPARSE (6 letters), and SCANT (5 letters). THIN means having little thickness or depth, RARE means not occurring often, SCARCE means not plentiful, SPARSE means thinly scattered or distributed, and SCANT means barely sufficient. All of these words describe something that is not abundant, meaning it is not plentiful or abundant in quantity.