1
general::
noun ADJ. gross, serious The official figures are a gross underestimate of the true number. PREP. ~ of, verb ADV. badly, considerably, greatly, grossly, massively, seriously, substantially He realized that he had seriously underestimated their strength. | totally | fatally VERB + UNDERESTIMATE tend to PHRASES sth should not be underestimated The importance of these feelings should not be underestimated.
Oxford Collocations Dictionary