From the old Hungarian illik (“to disappear, run away”) + -ékony (adjective-forming suffix denoting ability or tendency).
illékony (comparative illékonyabb, superlative legillékonyabb)
| Inflection (stem in -a-, back harmony) | ||
|---|---|---|
| singular | plural | |
| nominative | illékony | illékonyak |
| accusative | illékonyat | illékonyakat |
| dative | illékonynak | illékonyaknak |
| instrumental | illékonnyal | illékonyakkal |
| causal-final | illékonyért | illékonyakért |
| translative | illékonnyá | illékonyakká |
| terminative | illékonyig | illékonyakig |
| essive-formal | illékonyként | illékonyakként |
| essive-modal | — | — |
| inessive | illékonyban | illékonyakban |
| superessive | illékonyon | illékonyakon |
| adessive | illékonynál | illékonyaknál |
| illative | illékonyba | illékonyakba |
| sublative | illékonyra | illékonyakra |
| allative | illékonyhoz | illékonyakhoz |
| elative | illékonyból | illékonyakból |
| delative | illékonyról | illékonyakról |
| ablative | illékonytól | illékonyaktól |
| non-attributive possessive - singular |
illékonyé | illékonyaké |
| non-attributive possessive - plural |
illékonyéi | illékonyakéi |