imperative (n.)
- absolute
- absolutist
- acid
- acute
- allegiance
- ascendant
- authoritarian
- basic
- behest
- bidding
- binding
- burden
- burning
- business
- canon
- charge
- code
- command
- commandment
- commitment
- competent
- compulsive
- convention
- corrosive
- crying
- cutting
- dedication
- deference
- devoir
- devotion
- dictate
- dictation
- dictum
- directive
- dominant
- driving
- duty
- essential
- ethics
- exigency
- fealty
- final
- form
- formula
- fundamental
- governing
- great
- grinding
- guideline
- hest
- homage
- immediacy
- imperativeness
- imperial
- indicative
- inevitable
- instant
- law
- leading
- loyalty
- mandatory
- maxim
- mighty
- mission
- mitzvah
- mode
- mood
- moral
- mordant
- must
- necessary
- norm
- obligation
- official
- onus
- optative
- order
- ordering
- ordinance
- ought
- place
- pleasure
- potential
- predicament
- prerequisite
- prescript
- pressing
- pressure
- principle
- ranking
- regulation
- requisite
- respect
- rubric
- rule
- ruling
- say-so
- senior
- standard
- stern
- strict
- striking
- strong
- subjunctive
- superior
- suppressive
- telling
- tenet
- totalitarian
- ultimate
- urgency
- urgent
- vital
- will
- word
imperative (adj.)
- absolute
- absolutist
- absolutistic
- acid
- acute
- arbitrary
- aristocratic
- arrogant
- ascendant
- authoritarian
- authoritative
- authorized
- autocratic
- basic
- bidding
- binding
- biting
- bossy
- burning
- claimed
- clamant
- clamorous
- commanding
- compelling
- competent
- compulsive
- compulsory
- conclusive
- conditional
- consequential
- considerable
- constraining
- controlling
- corrosive
- critical
- crucial
- crying
- cutting
- decisive
- despotic
- dictated
- dictatorial
- directive
- dogmatic
- dominant
- domineering
- driving
- duty
- effective
- eminent
- empowered
- essential
- exigent
- feudal
- final
- forceful
- forcible
- form
- fundamental
- governing
- great
- gutsy
- hard-and-fast
- harsh
- hest
- high-handed
- high-pressure
- imperial
- imperious
- important
- importunate
- imposed
- impressive
- incisive
- indicative
- indispensable
- inevitable
- influential
- insistent
- instant
- instructive
- involuntary
- irresistible
- irrevocable
- law
- leading
- lordly
- magisterial
- mandatory
- masterful
- mighty
- mode
- momentous
- moral
- mordant
- must
- necessary
- necessitous
- nervous
- obligatory
- official
- oppressive
- optative
- order
- ought
- overbearing
- penetrating
- peremptory
- permissive
- piercing
- pivotal
- place
- poignant
- potent
- potential
- powerful
- preeminent
- prerequisite
- prescriptive
- pressing
- pressure
- prestigious
- prominent
- puissant
- ranking
- regulation
- repressive
- required
- requisite
- restraining
- ruling
- senior
- sensational
- severe
- sinewy
- slashing
- standard
- stern
- strict
- striking
- strong
- subjunctive
- substantial
- superior
- suppressive
- supreme
- telling
- totalitarian
- trenchant
- tyrannical
- tyrannous
- ultimate
- urgent
- vigorous
- vital
- weighty
- will