an estimation that is too low; an estimate that is less than the true or actual value
make too low an estimate of; "he underestimated the work that went into the renovation"; "Don't underestimate the danger of such a raft trip on this river"
without deviation; "the path leads directly to the lake"; "went direct to the office"
in a forthright manner; candidly or frankly; "he didn't answer directly"; "told me straight out"; "came out flat for less work and more pay"
without anyone or anything intervening; "these two factors are directly related"; "he was directly responsible"; "measured the physical properties directly"