nonfrivolous

Not trivially minded

Nonfrivolous describes something that has genuine merit or substance—not trivial, not merely for amusement.

The word appears most often in legal contexts, where courts distinguish nonfrivolous claims (those with at least arguable basis in law or fact) from frivolous ones that waste judicial resources: The judge found the petition nonfrivolous and allowed it to proceed.

substantive

meaningful

Having purpose or significance

material · considerable · serious · important · substantial · legitimate · genuine · real · relevant · worthwhile

credible

valid

Legally or logically sound

sound · reasonable · logical · coherent · supported · substantiated · verifiable · documented · evidence-based · arguable

legal

litigation

Legal dispute process

motion · filing · pleading · petition · grievance · allegation · cause of action · standing · merit · sanction

Opposites
seriousness/importance

nonfrivolousfrivolous

Not worthy of attention

trivial · petty · silly · flippant · inconsequential

legal/procedural merit

nonfrivolousfrivolous

Not worthy of attention

baseless · groundless · meritless · vexatious · spurious

Family

frivolous, frivolity, frivolousness, unfrivolous

Familiarity
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Used worldwide · Timeless · Abstract · Rated G