Modifiers matching microbe:

• infectious,
• viable,
• animal,
• damaging,
• pathogenic,
• intestinal,
• tiny,
• dangerous,
• conventional,
• waterborne,
• undesirable,
• new,
• effective,
• harmful,
• real,
• indigenous,
• higher,
• useful,
• unicellular,
• latent,
• destructive,
• primitive,
• invasive,
• biological,
• opportunistic,
• beneficial,
• photosynthetic,
• lethal,
• smaller,
• eukaryotic,
• intracellular,
• hazardous,
• small,
• marine,
• contagious,
• heterotrophic,
• model,
• invisible,
• nasty,
• toxic,
• anaerobic,
• parasitic,
• common,
• unwanted,
• deadly,
• larger,
• cellular,
• environmental,
• positive,

Simple categories matching undesirable:

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