something like this or similar can be ideal for a beginner
relatively upright - relaxed geometry - fat tires - low gearing - fairly simple / durable
the wide tires alone can make a big difference when the surface is compromised … much more forgiving - much greater ‘margin for error’
Examples from my garage that also would be excellent bikes for an adult (man or woman) to learn to ride as well as being useful for casual recreational riding later. No top bar to induce anxiety for a beginner as well as ease in mounting and even more importantly quickly dismounting, unbreakable and inexpensive as well as upright - relaxed geometry - fat tires - low gearing.
The red Schwinn and Calvin 3 speeds also have foot brakes as a bonus for simplicity and all weather reliability. Easy enough to leave in low gear while learning to ride.