| fortnightly | (adjective) occurring every two weeks | Synonyms: biweekly |
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| fortuitous | (adjective) occurring by happy chance | - |
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| (adjective) having no cause or apparent cause | Synonyms: causeless, uncaused |
| fortunate | (adjective) having unexpected good fortune | - |
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| (adjective) presaging good fortune | Synonyms: rosy |
| (adjective) supremely favored | Synonyms: golden |
| forty | (adjective) being ten more than thirty | Synonyms: 40, twoscore, xl |
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| forward | (adjective) at or near or directed toward the front | - |
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| (adjective) used of temperament or behavior; lacking restraint or modesty | - |
| (adjective) of the transmission gear causing forward movement in a motor vehicle | - |
| (adjective) moving forward | Synonyms: advancing, forward-moving |
| fusiform | (adjective) tapering at each end | Synonyms: cigar-shaped, spindle-shaped |
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| godforsaken | (adjective) located in a dismal or remote area; desolate | Synonyms: waste, wild |
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| imperforate | (adjective) not perforated; having no opening | - |
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| informal | (adjective) not formal | - |
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| (adjective) used of spoken and written language | - |
| (adjective) having or fostering a warm or friendly and informal atmosphere | Synonyms: cosy, cozy, intimate |
| (adjective) not officially recognized or controlled | Synonyms: loose |
| informational | (adjective) relating to or having the nature of information | - |
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| informative | (adjective) providing or conveying information | Synonyms: informatory |
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| (adjective) tending to increase knowledge or dissipate ignorance | Synonyms: enlightening, illuminating |
| (adjective) serving to instruct or enlighten or inform | Synonyms: instructive |
| informatory | (adjective) providing or conveying information | Synonyms: informative |
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| informed | (adjective) having much knowledge or education | - |
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| lentiform | (adjective) convex on both sides; shaped like a lentil | Synonyms: biconvex, convexo-convex, lenticular |
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| malformed | (adjective) so badly formed or out of shape as to be ugly | Synonyms: deformed, distorted, ill-shapen, misshapen |
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| misfortunate | (adjective) deserving or inciting pity | Synonyms: hapless, miserable, pathetic, piteous, pitiable, pitiful, poor, wretched |
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| morbilliform | (adjective) of a rash that resembles that of measles | - |
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| multiform | (adjective) occurring in or having many forms or shapes or appearances | - |
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| nonconforming | (adjective) not conforming to established customs or doctrines especially in religion | Synonyms: nonconformist |
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| nonconformist | (adjective) not conforming to some norm or socially approved pattern of behavior or thought | Synonyms: unconformist |
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| (adjective) not conforming to established customs or doctrines especially in religion | Synonyms: nonconforming |
| nonuniform | (adjective) not homogeneous | Synonyms: inhomogeneous |
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| oviform | (adjective) rounded like an egg | Synonyms: egg-shaped, elliptic, elliptical, oval-shaped, oval, ovate, ovoid, prolate |
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| panduriform | (adjective) (of a leaf shape) having rounded ends and a contracted center | Synonyms: fiddle-shaped, pandurate |
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| papilliform | (adjective) shaped like a papilla | - |
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| patelliform | (adjective) shaped like a dish or pan | Synonyms: dish-shaped, dished |
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| perforate | (adjective) having a hole cut through | Synonyms: perforated, pierced, punctured |
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| perforated | (adjective) having a number or series of holes | - |
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| (adjective) having a hole cut through | Synonyms: perforate, pierced, punctured |
| phylliform | (adjective) having the shape of a leaf | - |
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| reformable | (adjective) susceptible to improvement or reform | Synonyms: redeemable |
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| reformative | (adjective) tending to reform | Synonyms: reformatory |
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| reformatory | (adjective) tending to reform | Synonyms: reformative |
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| reformed | (adjective) caused to abandon an evil manner of living and follow a good one | - |
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| reformist | (adjective) favoring or promoting reform (often by government action) | Synonyms: progressive, reform-minded |
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| reinforced | (adjective) (used of soaps or cleaning agents) having a substance (an abrasive or filler) added to increase effectiveness | Synonyms: built |
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| (adjective) given added strength or support | Synonyms: strengthened |
| reniform | (adjective) (of a leaf or bean shape) resembling the shape of kidney | Synonyms: kidney-shaped |
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| sagittiform | (adjective) (of a leaf shape) like an arrow head without flaring base lobes | Synonyms: arrow-shaped, sagittate |
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| salamandriform | (adjective) shaped like a salamander | - |
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| salverform | (adjective) of or concerning a gamopetalous that has a slender tube and an abruptly expanded tip | - |
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| semiformal | (adjective) moderately formal; requiring a dinner jacket | Synonyms: black-tie, semi-formal |
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| straightforward | (adjective) pointed directly ahead | - |
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| (adjective) without evasion or compromise | Synonyms: square, straight |
| (adjective) without concealment or deception; honest | Synonyms: aboveboard |
| (adjective) free from ambiguity | - |
| transformable | (adjective) capable of being changed in substance as if by alchemy | Synonyms: convertible, translatable, transmutable |
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| transformed | (adjective) given a completely different form or appearance | - |
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| umbelliform | (adjective) resembling or in the form of an umbel | - |
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| uncomfortable | (adjective) providing or experiencing physical discomfort | - |
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| (adjective) conducive to or feeling mental discomfort | - |
| unconformable | (adjective) not correspondent | - |
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| unconformist | (adjective) not conforming to some norm or socially approved pattern of behavior or thought | Synonyms: nonconformist |
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| unenforceable | (adjective) not enforceable; not capable of being brought about by compulsion | - |
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| unenforced | (adjective) not enforced; not compelled especially by legal or police action | - |
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| unforbearing | (adjective) unwilling to endure | - |
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| unforced | (adjective) not resulting from undue effort; not forced | Synonyms: unstrained |
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| (adjective) not brought about by coercion or force | Synonyms: uncoerced, willing |
| unforceful | (adjective) lacking force; feeble | Synonyms: forceless |
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| unforeseeable | (adjective) incapable of being anticipated | - |
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| unforeseen | (adjective) not anticipated | Synonyms: out of the blue, unanticipated, unlooked-for, unseen |
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| unforesightful | (adjective) lacking foresight or scope | Synonyms: myopic, short, shortsighted |
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| unforested | (adjective) not covered with forest | - |
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| unforethoughtful | (adjective) lacking forethought | - |
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| unforfeitable | (adjective) not subject to forfeiture | Synonyms: inalienable |
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| unforgettable | (adjective) impossible to forget | - |
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| unforgivable | (adjective) not excusable | Synonyms: inexcusable |
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| unforgiving | (adjective) unwilling or unable to forgive or show mercy | - |
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| (adjective) not to be placated or appeased or moved by entreaty | Synonyms: grim, inexorable, relentless, stern, unappeasable, unrelenting |
| unformed | (adjective) not having form or shape | - |
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| (adjective) not formed or organized | - |
| unfortunate | (adjective) not favored by fortune; marked or accompanied by or resulting in ill fortune | - |
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| (adjective) not auspicious; boding ill | Synonyms: inauspicious |
| (adjective) unsuitable or regrettable | - |
| uniform | (adjective) always the same; showing a single form or character in all occurrences | Synonyms: unvarying |
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| (adjective) not differentiated | Synonyms: undifferentiated |
| (adjective) the same throughout in structure or composition | Synonyms: consistent |
| (adjective) evenly spaced | - |
| uniformed | (adjective) dressed in a uniform | - |
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| uninformative | (adjective) lacking information | - |
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| uninformed | (adjective) not informed; lacking in knowledge or information | - |
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| unperformed | (adjective) not performed | - |
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| unreformable | (adjective) unrepentant and incapable of being reformed | Synonyms: unregenerate |
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| (adjective) insusceptible of reform | Synonyms: irreclaimable, irredeemable, unredeemable |
| unreformed | (adjective) unaffected by the Reformation | - |
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| varicelliform | (adjective) resembling the rash of chickenpox | - |
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| variform | (adjective) varying in form or shape | - |
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| vasiform | (adjective) constituting a tube; having hollow tubes (as for the passage of fluids) | Synonyms: cannular, tube-shaped, tubelike, tubular |
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| vermiform | (adjective) resembling a worm; long and thin and cylindrical | Synonyms: worm-shaped |
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