overestimate
verb
uk/ˌəʊvəˈrestɪmeɪt/ us [ I or T ]
to think that something is or will be greater or more important than it really is:
grossly/wildly overestimate I think we have grossly overestimated the pace of growth.
Most people overestimate what they can achieve in a day and underestimate what they can achieve in a year.
Assess your potential earnings honestly - don't overestimate.
[ T ]
to think that someone is better at doing something, more intelligent, etc. than they really are:
I thought they would pick it up very quickly, but I overestimated them.
overestimation
noun [ C or U ]
Part of the problem was gross overestimation of ticket sales.
overestimate
noun [ C ]
uk/ˌəʊvəˈrestɪmət/ usan opinion that something is larger or more important than it really is:
Experts put the figure at $6 million, though this may be an overestimate.
Compare
underestimate