How many letters does the top answer for “an estimation that is too low; an estimate that is less than the true or actual value” have?

The most common answer is underestimate (13 letters).

Crossword clue: an estimation that is too low; an estimate that is less than the true or actual value

underestimate, underestimation, underrating.

3 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

underestimate 13 letters wn-def

make too low an estimate of

underestimation 15 letters wn-def

an estimation that is too low; an estimate that is less than the true or actual value

underrating 11 letters wn-def

an estimation that is too low; an estimate that is less than the true or actual value