Worth recommending; sensible and likely to have a good result if followed.
From 'advise' (from Old French 'aviser,' to consider) plus the suffix '-able' (capable of). The root traces to Latin 'ad-' (toward) and 'visus' (sight/consideration). The modern sense developed in the 14th-15th centuries.
Words ending in '-able' are one of English's most productive word-formation tools—almost any verb can become 'advisable,' 'doable,' or 'breakable'—which is why English speakers can understand new '-able' words they've never heard before.
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