1. Pertaining to a forest; sylvan; rustic. Forest-born, born in a wild. Forest laws, laws which were formerly very rigidly observed for governing and regulating forests, and preserving game. Forest-walk, a rural shady walk.

2. An extensive wood, or a large tract of land covered with trees; an uncultivated tract more or less covered with trees, or once so covered; a royal hunting ground.

3. To cover with trees.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• forresty,
• froest,
• florst,
• porest,
• freso,
• threst,
• nerest,
• dorest,
• fariest,
• forece,
• friest,
• corest,
• foerst,
• freat,
• oreste,
• forestyr,
• formost,
• foreast,
• fprest,
• foreget

• first-born,
• first-level,
• first-order,
• first-down,
• foerster,
• first-pitch,
• first-cousin,
• FRST,
• first-half,
• first-day,
• first-generation,
• first-classes,
• First-hand,
• frostier,
• meta-phrased,
• first-timer,
• first,
• forest-green,
• Phrased,
• furuset,
• trans-versed,
• Forewaste,
• first-aid,
• first-and-goal,
• first-course,
• fieriest,
• un-versed,
• first-name,
• Verset,
• frets,
• farside,
• head-first,
• Farced,
• HVRSD,
• FREST,
• forty-first,
• fraist,
• Foreside,
• para-phrased,
• first-floor,
• foresight,
• Forewost,
• re-versed,
• frost-free,
• freest,
• fairest,
• first-formed,
• frost-bound,
• first-time,
• first-grader,
• hoar-frost,
• Frost-blite,
• first-of-its-kind,
• frost-smoke,
• first-known,
• FRCID,
• first-refusal,
• thirty-first,
• forced-air,
• first-round,
• first-come-first-serve,
• first-served,
• Forest-oak,
• Frizzed,
• first-week,
• first-ballot,
• first-past-the-post,
• first-line,
• Furacity,
• frost-covered,
• first-grade,
• forester,
• forced-labor,
• viricide,
• fursuit,
• first-term,
• virucide,
• sorest,
• Frusta,
• worst-to-first,
• FRASTA,
• frost-bite,
• FARWEST,
• face-first,
• Friezed,
• Fraised,
• frost-weed,
• First-mover,
• rain-forest,
• first-string,
• first-graders,
• frost-nail,
• foresta,
• forest-tree,
• ferocity,
• Furiosity,
• veriest,
• first-light,
• first-rater,
• de-frost,
• first-sale,
• Feracity,
• fairiest,
• foreset,
• forest-management,
• Forest-fly,
• first-degree,
• then-first,
• first-class,
• first-base,
• in-versed,
• first-year,
• twenty-first,
• reforest,
• FORST,
• Forewiste,
• Foresaid,
• first-foot,
• un-forced,
• foremost,
• first-semester,
• first-in-first-out,
• first-team,
• feet-first,
• twenty-first-century,
• Forrest,
• first-water,
• forest-products,
• frost,
• virusoid,
• first-rounder,
• first-rateness,
• Fracid,
• re-phrased,
• first-come,
• first-person,
• first-nighter,
• first-century,
• Forcite,
• Forster,
• first-edition,
• Variscite,
• freesat,
• furst,
• forced,
• Frist,
• pharcyde,
• first-date,
• first-run,
• Forrester,
• forestage,
• forest-dwelling,
• forestall,
• verraszto,
• un-fairest,
• phorozooid,
• first-stage,
• forest-dependent,
• Forswat,
• frowst,
• forset,
• first-ever,
• first-leg,
• nose-first,
• firesuit,
• first-rounders,
• first-timers,
• varsity,
• first-best,
• frost-work,
• first-rank,
• first-blush,
• frowsty,
• first-tier,
• fret,
• forested,
• fireside,
• farsta,
• rest,
• first-period,
• first-trimester,
• forecast,
• first-in-the-nation,
• first-borns,
• versed,
• first-estate,
• forseti,
• Forest-marble,
• first-choice,
• first-night,
• -first,
• frosty,
• first-responders,
• Forwaste,
• Frost-bitten,
• forestry,
• Frizette,
• first-quarter,
• Versute,
• forestay,
• first-wave,
• first-named,
• team-first,
• first-fruits,
• phorocyte,
• frost-itch,
• hundred-and-first,
• firrest,
• first-rate,
• junior-varsity,
• fifty-first,
• verst,
• first-place,
• Frisette,
• Ferrest,
• in-veracity,
• FIRST-UP,
• voracity,
• first-draft,
• first-world,
• first-strike,
• back-first,
• forced-choice,
• farsed,
• veracity,
• forest-ranger,
• first-inning,
• first-responder,
• well-versed,
• first-preference,
• first-serve.

The adjective form of the word "forest" is "forested".

The plural of the "forest" can be the "forests".

The singular of the "forest" can be the "forest".