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I.e., one who, from the viewpoint of the pre-Islamic Arabs, would have no function other than "embellishing" a man's life.
Lit., "he finds himself in an invisible (ghayr mubin) conflict" - i.e., an inner conflict which he does not quite admit to his consciousness: cf. 16:59 - "he debates within himself:] Shall he keep this child despite the contempt [which he feels for it] - or shall he bury it in the dust?" (See also, in particular, the corresponding note [66].)
The softer sex is usually brought up among trinkets and ornaments, and, on account of the retiring modesty which for the sex is a virtue, is unable to stand up boldly in a fight and give clear indications of the will to win. Is that sort of quality to be associated with Allah?