Able to be used as an alibi or capable of serving as an excuse; capable of being alibied.
From 'alibi' with the suffix '-able' (meaning 'capable of'). This is a theoretically possible English adjective, though rarely used in actual practice.
English's incredible flexibility with suffixes means we can invent words like this on the fly—'alible' should mean something is 'capable of being an alibi,' but it's so rarely needed that it barely exists except in dictionaries.
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