underestimate
verb
• estimate (something) to be smaller or less important than it really is.
• "they have grossly underestimated the extent of the problem"
Similar:
set too low,
underrate,
miscalculate,
misjudge,
judge incorrectly,
estimate wrongly,
calculate wrongly,
be wrong about,
misconstrue,
misread,
err,
be wide of the mark,
rate too low,
undervalue,
set little/no store by,
not do justice to,
do an injustice to,
sell short,
play down,
understate,
minimize,
de-emphasize,
underemphasize,
diminish,
downgrade,
deflate,
reduce,
lessen,
brush aside,
gloss over,
trivialize,
hold cheap,
shrug off,
belittle,
misprize,
minify,
underestimate
noun
• an estimate that is too low.
• "£7.5 million is a considerable underestimate"