(of a railway line) not filled in with gravel or other materials
unballasted in American English
(ʌnˈbæləstɪd)
adjective
not steadied by ballast; unsteady
unballasted in American English
(unˈbæləstɪd)
adjective
1.
not fitted with or carrying ballast
2.
not properly steadied or regulated
Word origin
[1635–45; un-1 + ballasted]This word is first recorded in the period 1635–45. Other words that entered Englishat around the same time include: abutment, domesticate, focus, linear, naturalismun- is a prefix meaning “not,” freely used as an English formative, giving negative oropposite force in adjectives and their derivative adverbs and nouns (unfair; unfairly; unfairness; unfelt; unseen; unfitting; unformed; unheard-of; un-get-at-able), and less freely used in certain other nouns (unrest; unemployment)