(for etym. see RC xxxii 195 ) adj. and subst. good ; an O.-Ir. word, in later lang. confined to poetic and archaizing style : fó .i. maith, O'Cl., Lec. Gl. 154 , bonum O'Mulc. 547 . fó ainm do mhaith is do mhíadh, Metr. Gl., Ff. 4 . As pred. : fó díbad (.i. maith a epiltiu), LU 678 ( ACC 31 ). ma dagnet ní airi is fó it is well Mon. Tall. § 2 . fó cach scél, RC xxvi 34.172 . fó (.i. maith) mo cherd láechdachta, LU 6169 . fó mo cosc, Ériu i 118.11 . Cf. in tan ba fó fīrUlltaig, MR 200.5 . sech ba fial ba fíu ba fó, LL 35a21 = Rawl. 84a7 . nī fó LU 3947 ( SCC 44 ). ní fó an fecht dochuadhais, ZCP xiii 172.20 . Cf. gé iarradh neach ní budh mō, | urdail frighedh nī fō fair it is not right to add to it (?) vii 302z (= fó, YBL 318b26 ). Michiae, ba fó fia, SR 7455 . maith fer Patraic ... fó fer Patraic, Trip. 242.24 ( Trip.² 2874 ). maith fer Macc Cecht, fó fer Macc Cecht, BDD 157 . fil fora chend cid fó fer | ... tri foilt, LU 3822 ( SCC 37 ). fo fo cech scel (.i. is maith is maith cach scel), Rawl. 110b12 (= RC xxvi 34 ). fo bioath (= biad) indso `good food this' RC xii 86 . fó Dei (gl. bonus Deus) Auraic. 3341 . fo dia, a Feidlimid! hail! Hib. Min. 66.3 . fodia .i. fo ┐ dies .i. fó láe, O'Mulc. 590 . fó líth .i. sén maith `good luck' O'Cl. is fólíth linn in scéul sin, IT i 128.11 . do A. nirb fo lith, SR 6189 . nír fó líth | liṅges Ír sech Íth, LL 12b25 . fō mind, ZCP xi 109 § 12 . fó sén dia ngaib O. Alpain it was a lucky hour when O. took possession of Alba IT iii 33 § 7 ( Bruchst. i § 4 ). ní fó sén i tancas din tochmarc-sa, TFerbe 95 . fó húar mad mé foglesed, Ériu ii 63 § 1 . IS FÓ LIMM I deem good, like, am satisfied (with ), folld. by subst. or clause : fo lib lige a ai (.i. is maith lib ...) LU 1065 ( ACC 106 ). ba fo leo in frithi, Aen. 360 . is fo lium cia rafesid (gl. non volumus ignorare vos) Wb. 14b20 . fó (.i. maith) leó rodascload nech, Hy v 53 . bid fó lim donísed comartha n-úait, LU 5402 . ni head condaigimm ... ; fó liumm cé notísad de, MacCongl. 21.25 . ba maith dano limsa ... acht bith fó lat so, ZCP viii 310.18 . Sometimes equiv. to is cumma limm I care not, am indifferent: is fo limsa mu laiget my smallness does not trouble me ZCP vii 297 (quoted by O'Cl. under fó .i. cuma). fó limsa ón ... cia théis I don't mind if he go LU 5554 . fó limsa ón ... case [ = cibē St] chruth i mbet, TBC-LL¹ 447 (= cumma lem, LU 4654 ). fo leis gid no rissed ┐ ba fo leis gin co rissed, 2190 (= cuma les St). ba fo laiss cidh ár noláthe for a muintir, acht ... he cared not ... so long as ... CCath. 3730 . bá fó leis a bádhadh féin acht co mbáidhedh a námhait leis, 2155 . IS FÓ DOM it is good (no harm) for me: cid as fó dam ?, Tec. Corm. § 12 . fó duit-siu gid dia mbendaib nochingthe you might safely step TBC-LL¹ 1346 = is cuma duit cid ... chinge St. fó dúib fatchius, 504 . fo duit cia nocotailtea it would be well for thee to sleep Laws i 72.21 Comm.

Rarely attrib. : funchi fó, LU 3054 . fiada fó, LL 278a33 ( Ériu i 68 : `the good God'). ? fri ferccai fōa 'fine warriors', ​BDC 144.632 ​.

As adv. (?) : snigfid fairne [ferna v.l.] fer ga fó, TBC-LL¹ 539 (co fo. go fó v.l.). Compar. ca soithech fithir is fo ? (.i. ca hadbhur oide is ferr), ZCP v 488 § 7 (B. na f.).

As subst. : n. and m. fó n-olc (gl. bonum malum) ZCP vii 480 ( Enchir. Aug. 71a ). is e a fó in fó thall his good is the good yonder (i.e. Heaven) Goid. 94 . ? cáin cach fó, RC xxvi 34 (fou v.l.). cach fó dó ... co ndá (.i. co tuca ... gach maith dó), ZCP v 489 § 13 (B. na f.). nach fō rocólae ┐ nach maith atcondairc, iii 452.12 . Eo Rosa ... fó foirne the good of a multitude (?) LL 200a3 . Cf. is tir hi fuil fó, LU 3058 .

The follg. may contain the gen.: fói leis cía nobeth inti, fói leis cenco beith, TTr.² 1235 ( = foi ... foi, LL 406b51 ). is faoi leis an bhfear ... gion go ndéine inn d'ionnlach | sinn dá chēile coimhdhiomdhach = he is content GF, Ir. Monthly 1919, 568 ( DDána 101.48 ).

Compds. Possibly the follg. (if not compds. of the prep. fo): co Feradach Finn Fechtnach fobéo [fobeu v.l.] of happy life (?) ZCP xi 91 § 3 (the corresp. section in A has F.F.F. Fo buan ib. 80 ). Ogam focosach `well-footed' [?] (a kind of Ogham in which the strokes were dotted) Auraic. 6062 . Cf. also: dedol ... .i. dā fhōthadáil. dá dagthodail do dhía, Thr. Ir. Gl. 15 .