Informal or colloquial term meaning resembling, containing, or affected by fungus; fungous or moldy.
Derived from fungus + -y suffix (Old English -ig, used to create adjectives meaning 'having the quality of' or 'full of'). This is a more casual, modern formation than the more formal 'fungous.'
This is exactly how English evolves—people naturally add '-y' to nouns to make adjectives, so while 'fungusy' isn't in most dictionaries, it shows how speakers intuitively create words by following patterns, even if formal language prefers 'fungal' or 'fungous.'
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