Princeton's WordNet

1. overestimate, overestimation, overvaluation, overappraisal(noun)

   an appraisal that is too high

2. overestimate, overestimation, overrating, overreckoning(verb)

   a calculation that results in an estimate that is too high

3. overestimate, overrate(verb)

   make too high an estimate of

   "He overestimated his own powers"

4. overvalue, overestimate(verb)

   assign too high a value to

   "You are overestimating the value of your old car"

Kernerman English Learner's Dictionary

1. overestimate(verb)ˌoʊ vərˈɛs təˌmeɪt; n. ˈoʊ vərˈɛs tə mɪt

   ≠ underestimate

   We overestimated the number of guests.

Wiktionary

1. overestimate(Verb)

   to judge too highly

   Experts overestimate the level of harm of cigarettes.

• oorskat, te hoog skatAfrikaans
• يُغالي في تَقْديرArabic
• надценявамBulgarian
• superestimarPortuguese (BR)
• přecenitCzech
• überschätzenGerman
• overvurdereDanish
• υπερεκτιμώGreek
• sobreestimarSpanish
• ülehindamaEstonian
• زیادی تخمین زدنFarsi
• yliarvioidaFinnish
• surestimerFrench
• לְהעֲרִיך הַעֲרַכַת יֶתֶרHebrew
• ज्यादा मूल्यांकन करनाHindi
• precijenitiCroatian
• túlbecsülHungarian
• menganggap terlalu tinggiIndonesian
• ofmetaIcelandic
• sopravvalutareItalian
• 過大評価するJapanese
• 과대 평가하다Korean
• pervertintiLithuanian
• pārvērtēt, novērtēt par augstuLatvian
• membuat anggaran yg berlebihanMalay
• overschattenDutch
• overvurdereNorwegian
• przecenićPolish
• زیادی تخمین زدنPersian
• ډير تخمين وهلPashto
• sobrestimarPortuguese
• a supraestimaRomanian
• переоцениватьRussian
• preceniťSlovak
• precenitiSlovenian
• precenitiSerbian
• överskatta, övervärderaSwedish
• ประเมินมากเกินไปThai
• değerlendirmede abartmakTurkish
• 過高估計，評價過高Chinese (Trad.)
• переоцінюватиUkrainian
• زيادہ اندازہ لگاناUrdu
• đánh giá quá caoVietnamese
• 对…估计过高，评价过高Chinese (Simp.)