i, dedirn ( Mon. Tall. 149. 6 ), dédhoirnn ( O'Dav. 736 ), Oir. adj. of uncertain derivation, occasionally occurring in early Mid.-Ir. compositions in poetry and standing phrases. n p. dedarnni, Ml. 97 b 3 . a p. dedoirne, O'Dav. 736 . d p. dedarnaib, Ml. 22 c 4 . COMP. dedarnnu, 57 a 6 .

I Strong, strenuous , transl. Lat. strenuus : a uiris strenuis, gl. dedarnaib, Ml. 22 c 4 . strenuum principem, gl. dedairnn, 48 c 4 . cum essent strenui, gl. dedarnni, 97 b 3 . Glossed by calma : tinfeth dedoirn .i. teipsi calma, O'Dav. 736 .

II Strong, hard, firm, strict, severe, troublesome , transl. Lat. arctus (i.e. artus) and given as Synon. with imnedach and timmartae (a literal transl. of Lat. artus) : omnes illos ita ultio arcta concludat ut. .i. dedairnn .i. timmartae, Ml. 44 a 2 . artiores rerum praesentium necessitates, gl. ata dedarnnu .i. ata thimmartu ón ┐ ata imnedchu, 57 a 6 . —abstinit dedirn doa traothad strict abstinence to subdue them Mon. Tall. 149. 6 . Joined to dúr : lám fo chrábud deduirn dúr, ACL iii 306 st 4 (11th-century poem). dédhoirn .i. demin nó calma ut est : cía concorad cétchuru dúra dedoirne (v.l. durn dedoirn) .i. cura daingne nó demni, O'Dav. 736 . —Cf. dedarn-tuae.