| exfiltrate | (verb) escape furtively, as from an area under enemy control | - |
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| (verb) transfer secretly out of an area under enemy control | - |
| filter | (noun) device that removes something from whatever passes through it | - |
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| (noun) an electrical device that alters the frequency spectrum of signals passing through it | - |
| (verb) remove by passing through a filter | Synonyms: filter out, filtrate, separate out, strain |
| (verb) pass through | Synonyms: percolate, permeate, sink in |
| (verb) run or flow slowly, as in drops or in an unsteady stream | Synonyms: dribble, trickle |
| filth | (noun) an offensive or indecent word or phrase | Synonyms: dirty word, obscenity, smut, vulgarism |
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| (noun) a state characterized by foul or disgusting dirt and refuse | Synonyms: filthiness, foulness, nastiness |
| (noun) anything regarded as making something unclean | Synonyms: dirt, grease, grime, grunge, soil, stain |
| (noun) any substance considered disgustingly foul or unpleasant | Synonyms: crud, skank |
| filthily | (adverb) in a filthy unclean manner | Synonyms: dirtily |
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| filthiness | (noun) moral corruption or pollution | - |
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| (noun) a state characterized by foul or disgusting dirt and refuse | Synonyms: filth, foulness, nastiness |
| filthy | (adjective) disgustingly dirty; filled or smeared with offensive matter | Synonyms: foul, nasty |
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| (adjective) characterized by obscenity | Synonyms: cruddy, foul, nasty, smutty |
| (adjective) vile; despicable | Synonyms: dirty, lousy |
| filtrate | (noun) the product of filtration; a gas or liquid that has been passed through a filter | - |
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| (verb) remove by passing through a filter | Synonyms: filter, filter out, separate out, strain |
| filtration | (noun) the act of changing a fluid by passing it through a filter | - |
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| (noun) the process whereby fluids pass through a filter or a filtering medium | - |
| infiltrate | (verb) pass through an enemy line; in a military conflict | Synonyms: pass through |
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| (verb) cause (a liquid) to enter by penetrating the interstices | - |
| (verb) pass into or through by filtering or permeating | - |
| (verb) enter a group or organization in order to spy on the members | Synonyms: penetrate |
| infiltration | (noun) a process in which individuals (or small groups) penetrate an area (especially the military penetration of enemy positions without detection) | - |
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| (noun) the slow passage of a liquid through a filtering medium | Synonyms: percolation |
| infiltrator | (noun) an intruder (as troops) with hostile intent | - |
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| (noun) someone who takes up a position surreptitiously for the purpose of espionage | - |