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daft [daft 词源字典]: daft: [13] Daft was not always a term of reproach. It originally meant ‘mild, gentle’, and only in late Middle English slid to ‘stupid’ (in a semantic decline perhaps paralleling that of silly, which started off as ‘happy, blessed’). Middle English dafte corresponds directly to an Old English gedæfte, whose underlying sense seems to have been ‘fit, suitable’ (the sense connection was apparently that mild unassuming people were considered as behaving suitably).

There is no direct evidence of its use with this meaning, but Old English had a verb gedæftan ‘make fit or ready, prepare’ which, together with the Gothic verb gedaban ‘be suitable’, points to its origin in a Germanic base *dab- ‘fit, suitable’. This ties in with the semantic development of deft, a variant of daft, which has moved from a prehistoric ‘fit, suitable’ to ‘skilful’.
=> deft[daft etymology, daft origin, 英语词源]
adequately (adv.): 1620s, from adequate + -ly (2); originally a term in logic in reference to correspondence of ideas and objects. Meaning "suitably" is recorded from 1680s.
ambrotype (n.): 1855, American English, apparently from Greek ambrotos "immortal, imperishable" (see ambrosia), with second element from daguerreotype. A type of photograph on glass with lights given by silver and shades by a dark background showing through.
This invention consists in an improved process of taking photographic pictures upon glass, and also of beautifying and preserving the same, which process I have styled "ambrotype." My improved process has reference to the art of taking pictures photographically on a film of collodion upon the surface of a sheet of glass, the collodion being suitably prepared for the purpose. By the use of the said process, the beauty and permanency of such pictures are greatly increased, and I have on this account styled the process "ambrotype," from the Greek word ambrotos, immortal. ["Specification of the Patent granted to James A. Cutting, of Boston, in the United States of America, Photographer, for an Improved Process of taking Photographic Pictures upon Glass and also of Beautifying and Preserving the same. Dated London, July 26, 1854," printed in "Journal of the Franklin Institute," September 1855]
pat (adv.): "aptly, suitably, at the right time," 1570s, perhaps from pat (adj.) in sense of "that which hits the mark," a special use from pat (n.) in sense of "a hitting" of the mark. The modern adjective is 1630s, from the adverb.
suitable (adj.): 1580s, from suit (v.) + -able. Earlier suit-like (1560s); suitly (mid-15c.). Related: Suitably; suitableness.
unduly (adv.): late 14c., "without due moderation; improperly, unsuitably;" see undue + -ly (2). From early 15c. as "unjustly, wrongfully."
unkindly (adv.): c. 1200, "unsuitably, improperly," from un- (1) "not" + kindly (adv.). From mid-15c. as "discourteously, maliciously."
unsuitable (adj.): 1590s, from un- (1) "not" + suitable (adj.). Related: Unsuitably; unsuitability.
accordantly: "Suitably, properly; harmoniously, agreeably; accordingly", Late Middle English; earliest use found in Reginald Pecock (c1392–?1459), bishop of Chichester and religious author. From accordant + -ly.