Synonyms of the word

discretional

• adj. discretionary.

arbitrary

• adj. (usually of a decision) Based on individual discretion or judgment; not based on any objective distinction,…
• adj. Determined by impulse rather than reason; heavy-handed.
• adj. (mathematics) Any, out of all that are possible.
• adj. Determined by independent arbiter.
• adj. (linguistics) Not representative or symbolic; not iconic.
• n. Anything arbitrary, such as an arithmetical value or a fee.

discretionary

• adj. Available at one's discretion; able to be used as one chooses; left to or regulated by one's own discretion…