Modifiers matching gas:

• inert,
• ordinary,
• minor,
• rare,
• foreign,
• combustible,
• beneficial,
• key,
• acid,
• noble,
• corrosive,
• consumable,
• polar,
• pure,
• common,
• vital,
• industrial,
• lighter,
• familiar,
• residual,
• hydrophobic,
• explosive,
• flammable,
• working,
• toxic,
• floating,
• valuable,
• vesicant,
• interfering,
• electronegative,
• invisible,
• identifiable,
• injurious,
• airborne,
• inorganic,
• base,
• tenuous,
• weak,
• manufactured,
• monoatomic,
• suitable,
• warm,
• thin,
• artificial,
• supercritical,
• lightweight,
• atomic,
• popular,
• poisonous,
• innocuous,
• frozen,
• essential,
• special,
• additional,
• hazardous,
• under,
• complex,
• hot,
• cheap,
• heated,
• deleterious,
• dilute,
• out,
• controlled,
• important,
• relevant,
• organic,
• convenient,
• biogenic,
• indoor,
• propellant,
• ionic,
• radioactive,
• hydrophilic,
• electropositive,
• cold,
• medical,
• environmental,
• sulfurous,
• saturated,
• relativistic,
• monatomic,
• dry,
• impure,
• abundant,
• aggressive,
• oxidizable,
• edible,
• fixed,
• metal,
• acidic,
• metabolic,
• elemental,
• supportive,
• raw,
• compressible,
• obnoxious,
• traditional,
• small,
• single,
• expensive,
• benign,
• liquefied,
• dangerous,
• model,
• refrigerant,
• malign,
• stable,
• nonpolar,
• synthetic,
• particular,
• active,
• rich,
• unique,
• commercial,
• neutral,
• harmless,
• suffocating,
• off,
• starting,
• diffusing,
• undesirable,
• absorptive,
• liquid,
• dissolved,
• reactive,
• inexpensive,
• anthropogenic,
• nonflammable,
• heavier,
• surrounding,
• malodorous,
• medium,
• supplemental,
• major,
• paramagnetic,
• number,
• faster,
• passive,
• chemical,
• auxiliary,
• standard,
• buoyant,
• carcinogenic,
• incoming,
• individual,
• available,
• miscellaneous,
• rarefied,
• compressed,
• mental,
• mixed,
• ambient,
• secondary,
• medicinal,
• luminous,
• moving,
• light,
• volatile,
• inflammable,
• permanent,
• conductive,
• real,
• clean,
• supporting,
• damaging,
• harmful,
• extraneous,
• detrimental,
• fast,
• mobile,
• scientific,
• incombustible,
• respiratory,
• protective,
• warming,
• critical,
• classical,
• atmospheric,
• diamagnetic,
• heavy,
• irritating,
• refrigerated,
• conventional,
• unstable,
• ignitable,
• dusty,
• soluble,
• alkaline,
• basic,
• deadly,
• liquified,
• separate,
• dense,
• diatomic,
• desirable,
• strong,
• cryogenic,
• safe,
• noxious,
• transparent,
• unwanted,
• external,
• carbonaceous,
• automotive,
• insoluble,
• useful,
• nontoxic,
• molecular,
• oxidative,
• technical,
• simple,
• noncombustible,
• unsaturated,
• natural,
• divalent,

Simple categories matching undesirable:

• behavior,
• motive,
• bird,
• activity,
• phenomenon,
• emotion,
• adduct,
• trait,
• defect,
• sediment,
• flora,
• substance,
• pest,
• status,
• weather,
• trouble,
• constituent,
• ingredient,
• light,
• algae,
• creature,
• volatile,
• cause,
• event,
• route,
• fauna,
• deposit,
• condition,
• animal,
• layer,
• adaptation,
• attribute,
• behaviour,
• result,
• material,
• propensity,
• reaction,
• zone,
• conduct,
• complication,
• software,
• area,
• growth,
• thing,
• filler,
• practice,
• microbe,
• noise,
• occurrence,
• item,
• bug,
• solid,
• facility,
• sector,
• lie,
• fluid,
• formation,
• situation,
• vermin,
• scene,
• bacteria,
• particle,
• mammal,
• part,
• pathogen,
• pattern,
• object,
• use,
• elements,
• artifact,
• content,
• lipid,
• phase,
• code,
• surface,
• property,
• process,
• nutrient,
• product,
• passion,
• industry,
• feature,
• pollutant,
• thought,
• location,
• stabilizer,
• experience,
• consequence,
• gas,
• flaw,
• mutation,
• symptom,
• matter,
• metal,
• rodent,
• quality,
• characteristic,
• website,
• motion,
• plant,
• compound,
• incident,
• odour,
• mail,
• outcome,
• microorganism,
• contaminant,
• vegetation,
• component,
• agent,
• mineral,
• action,
• angle,
• taste,
• email,
• chemical,
• cation,
• organism,
• cell,
• alteration,
• residue,
• sensation,
• state,
• communication,
• metabolite,
• precipitate,
• change,
• waste,
• character,