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in·ca·pa·ble

incapable

 
pronunciation:
In keI p bl
features:
Word Parts
part of speech: adjective
definition 1: not having the ability or power that is needed; not able.
With an injured foot, he is incapable of climbing the mountain.I am incapable of doing five things at once.
synonyms:
unable
antonyms:
able, capable
definition 2: without skill; poor.
He is a completely incapable actor.
antonyms:
capable, competent
derivations: incapably (adv.), incapability (n.)
Word Parts  About this feature
The word incapable contains the following parts:
in-2 Latin prefix that means not, without
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The prefix in-2 occurs in Latin loanwords and attaches to Latinate bases. The bases of most words prefixed with in-2 are independent adjectives (inadvertent, incognizant), although the base adjective may no longer be in widespread use (as with incessant ). Exceptions include iniquitous and indignant . -in2 has multiple forms, as the 'n' sound in in-2 assimilates to the initial sound of the base to which it is attached. See the assimilated forms ig-, il-2, im-2, and ir-2.
cap1, cip, capt, cept, -ceive, -ceit Latin root that means to take, catch
-able, -ible, -ble Latin adjective-forming suffix that means capable of being, doing, or undergoing
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The suffix -able , and its variants, is attached to Latin verb roots or English transitive verbs to form adjectives. (In a small set of cases, -able is attached to a noun, e.g. knowledgeable and marriageable.) For spelling purposes, it is useful to know that -able is more likely to be added to a whole English word (comparable, adorable ), while -ible is more likely to follow a bound root (visible , legible ). However,there are still many words which combine a root with -able (capable , inevitable ). The suffix -ity can be added to any adjective ending in -able , -ible , -ble to produce a corresponding noun ending in -ability, -ibility, -bility (possible + -ity > possibility; irrevocable + -ity > irrevocability.)