Adjectives that begin with INS are listed here.
insane
insatiable
inscrutable
insecure
insensitive
inseparable
inshore
inside
insidious
insignificant
insincere
insipid
insistent
insolent
insoluble
inspirational
inspiring
instant
instantaneous
instinctive
instinctual
institutional
instructional
instructive
instrumental
insubordinate
insubstantial
insufficient
insulting
insuperable
insurgent
insurmountable
Enjoy exploring the other starting letter lists of adjectives on this educational website, for letters A-Z.
Did I miss any adjectives? Please add them here. Thanks.