Adjective
promiscuous - Lacking discretion or selectivity, especially in choosing relationships or associates; mixing or combining things randomly.

The character in the novel was portrayed as promiscuous, frequently engaging in relationships without commitment or emotional attachment.
regimented - Referring to something that is arranged in a highly structured or ordered manner, often with little room for flexibility or deviation.

He was determined to lose weight, and he realized that he could accomplish this only with a regimented approach to exercize and diet.