All crucial antonyms

adj crucial

• insignificant — unimportant, trifling, or petty: Omit the insignificant details.
• trivial — of very little importance or value; insignificant: Don't bother me with trivial matters.
• unimportant — of much or great significance or consequence: an important event in world history.
• inessential — not essential; not necessary; nonessential.
• unnecessary — not necessary or essential; needless; unessential.
• optional — left to one's choice; not required or mandatory: Formal dress is optional.
• voluntary — done, made, brought about, undertaken, etc., of one's own accord or by free choice: a voluntary contribution.
• minor — lesser, as in size, extent, or importance, or being or noting the lesser of two: a minor share.
• uncritical — not inclined or able to judge, especially by the application of comparative standards: an uncritical reader.
• secondary — next after the first in order, place, time, etc.