Prefix · quantity / insufficiency
Signals insufficiency or less than the required level: underestimate, underpaid, undercooked.
Written by Bryan López, English teacher · Updated
Under- is the direct opposite of over-. It always signals that something falls below the necessary, correct, or expected level. With verbs it means doing something insufficiently: underestimate, underperform, undercharge. With past participles it describes a state of insufficiency: underpaid, undercooked, underdeveloped.
Like over-, under- has a spatial meaning: below or beneath. underground = beneath the ground; underwater = beneath the water; underline = draw a line beneath. "Undermine" literally means to dig beneath a structure to weaken it. This spatial sense often extends into figurative language: "undermine confidence" = dig beneath and weaken someone's confidence.
Attaches directly to verbs, past participles, and nouns:
No spelling change to the root. Stress falls on the first syllable: /ˈʌndər/.
under-/ˈʌndər/
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"Don't underestimate her" = do not think her less capable than she is. The prefix applies to any kind of assessment, not just numerical ones.
"This underlines the need for change" = this highlights the need for change. The figurative use is extremely common in formal writing.
A trick to remember it
Picture something that does not reach the level it should. Underpaid = the salary does not reach the right level; undercooked = the cooking does not reach the right level; underperform = the results do not reach the expected level. That single image of "falling short" applies to every under- word.
Exercise 1 · Form the word
Exercise 2 · Pick the right one
"Many talented employees feel ___ despite years of experience and strong results."
Exercise 3 · Pick the right one
What is the difference between "underground" and "underwater"?
The prefix under- signals insufficiency or less than the required level: underestimate, underpaid, undercooked. In Spanish it usually maps to sub- / insuficiente.
The prefix under- is pronounced /ˈʌndər/. For example, "underestimate".
"estimate" becomes "underestimate". It is a typical example of the under- prefix.
un-, re-, pre-, dis-, over-, in-... every beginning you need to unlock thousands of English words at once.