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ir·re·vers·i·ble

irreversible

 
pronunciation:
I r vuhr s bl
features:
Word Parts
part of speech: adjective
definition: impossible to reverse, turn back, or change.
No matter how much we begged, going to bed at eight o'clock was an irreversible rule.
derivations: irreversibly (adv.), irreversibility (n.)
Word Parts  About this feature
The word irreversible contains the following parts:
ir-2 Latin prefix that means not, without
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The prefix ir-2 occurs in Latin loanwords. It is an assimilated form of in-2 used before base words that begin with 'r.' See in-2
-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.)