charlatan = a person falsely claiming to have a special knowledge or skill.

 charlatan

/ˈʃɑːlət(ə)n/

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noun

noun: charlatan; plural noun: charlatans

1. a person falsely claiming to have a special knowledge or skill.

   "a self-confessed con artist and charlatan"

cantankerous = bad-tempered, argumentative

 can·tan·ker·ous

[kanˈtaŋk(ə)rəs]

ADJECTIVE

1. bad-tempered, argumentative, and uncooperative:

   "he can be a cantankerous old fossil at times"

Gemütlich [ge-MOOT-lik] 1. Pleasant and cheerful.

 

The woman was a __________ host, welcoming all the guests warmly.

Gemütlich  [ge-MOOT-lik]  1.  Pleasant and cheerful.

Prepossessing [pree-pə-ZES-ing] 1. Attractive or appealing in appearance.

 Prepossessing

[pree-pə-ZES-ing]

1.

Attractive or appealing in appearance.

Supererogation [soo-pər-ər-ə-GEY-shun] 1. The performance of more work than duty requires.

 Supererogation

[soo-pər-ər-ə-GEY-shun]

1.

The performance of more work than duty requires.

pensile /ˈpɛnsʌɪl/ adjective adjective: pensile hanging down; pendulous. "pensile nests"

 

pensile

/ˈpɛnsʌɪl/

adjective

adjective: pensile

    hanging down; pendulous.

    "pensile nests"

Recondite [rə-KAHN-diyt] 1. Little known; obscure, (specifically regarding knowledge).

 Recondite

[rə-KAHN-diyt]

1.

Little known; obscure, (specifically regarding knowledge).

Delineate [də-LIN-ee-ayt] 1. Describe or portray (something) precisely.

 

Delineate

[də-LIN-ee-ayt]

1.

Describe or portray (something) precisely.

Frabjous [FRAB-jəs] 1. Delightful; joyous.

 

Frabjous

[FRAB-jəs]

1.

Delightful; joyous.

efficacious -(of something inanimate or abstract) successful in producing a desired or intended result; effective

 efficacious

/ˌɛfɪˈkeɪʃəs/

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adjective

formal

adjective: efficacious

1. (of something inanimate or abstract) successful in producing a desired or intended result; effective.

   "this treatment was efficacious in some cases"

   h 

extrapolate - extend the application of (a method or conclusion) to an unknown situation by assuming that existing trends will continue or similar methods will be applicable.

 extrapolate

/ɪkˈstrapəleɪt,ɛkˈstrapəleɪt/

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verb

verb: extrapolate; 3rd person present: extrapolates; past tense: extrapolated; past participle: extrapolated; gerund or present participle: extrapolating

1. extend the application of (a method or conclusion) to an unknown situation by assuming that existing trends will continue or similar methods will be applicable.

   "the results cannot be extrapolated to other patient groups"

   • estimate or conclude (something) by extrapolating.

     "the figures were extrapolated from past trends"
   • Mathematics

     extend (a graph, curve, or range of values) by inferring unknown values from trends in the known data.

     "the low-temperature results can be extrapolated to room temperature"