Tremendous

google

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mid 17th century: from Latin tremendus (gerundive of tremere ‘tremble’) + -ous.

wiktionary

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From Latin tremendus(“fearful, terrible”), gerundive of tremō(“to tremble”), + -ous.

etymonline

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tremendous (adj.)

1630s, "awful, dreadful, terrible," from Latin tremendus "fearful, to be dreaded, terrible," literally "to be trembled at," gerundive form of tremere "to tremble" (see tremble (v.)). Hyperbolic or intensive sense of "extraordinarily great or good, immense" is attested from 1812, paralleling semantic changes in terrific, terrible, dreadful, awful, etc. Related: Tremendously.