Hit-or-miss and Spur-of-the-moment

Hit-or-miss adjective - Lacking a definite plan, purpose, or pattern.

Spur-of-the-moment and hit-or-miss are semantically related. In some cases you can use "Spur-of-the-moment" instead an adjective phrase "Hit-or-miss".

Spur-of-the-moment adjective - Made or done without previous thought or preparation.

Hit-or-miss and spur-of-the-moment are semantically related. Sometimes you can use "Hit-or-miss" instead an adjective phrase "Spur-of-the-moment".