Synonyms of 'fallow'
1 uncultivatedDictionary, unused, undeveloped
The fields lay fallow.
2 inactiveDictionary, resting, idle
There followed something of a fallow period.
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The hamster lapses into a dormant state in cold weather.
If you say that someone is idle, you disapprove of them because they are not doing anything and you think they should be.
I've never met such an idle bunch of workers!
Thesaurus for fallow from the Collins English Thesaurus
Fallow land has been dug or ploughed but nothing has been planted in it, especially so that its quality or strength has a chance to improve .