St Bernard of Clairveaux saw a vision while his monks were at prayer. There were angels standing behind the monks recording their prayers with a pen. Some of the angels were recording the prayer in gold, some of them in silver, some of them in ink, some of them in water, and some of the angels were standing still and not writing at all.
The angels recording in gold, silver, or ink were writing down the prayers of the monks. The angels recording in water were recording, but the water quickly evaporated, because they were recitations without real intent or awareness of God. The angels standing still weren’t recording at all, because the monks had no awareness of God in their mind.
Having an awareness of God in your thoughts and a love & holy fear towards him is prayerful: actual words being formed is not necessary. Sometimes spouses talk to each other casually, sometimes more seriously, and sometimes they are just enjoying each others’ company.