for the most part; he is mainly interested in butterflies
[ Syn: principally , principally , primarily , primarily , mainly , mainly , in the main , in the main , principally , principally , primarily , primarily , mainly , mainly , in the main , in the main , principally , principally , primarily , primarily , mainly , mainly , in the main , in the main , principally , principally , primarily , primarily , mainly , mainly , in the main , in the main ]