tehokas

teho- +‎ -kas

• IPA^(key): /ˈtehokɑs/,
• Rhymes: -ehokɑs
• Syllabification^(key): te‧ho‧kas

tehokas (comparative tehokkaampi, superlative tehokkain)

1. powerful, potent
2. efficient
3. effective (see usage notes)

This word is used for both effective and efficient; there is no distinction and it must be expressed through other means if necessary. In addition to using tehokas for both, effective could be translated as vaikuttava, tehoava, toimiva or tuloksia tuottava (“which produces results”), while efficient may be described with terms like säästäväinen (“prudent, frugal, thrifty”) and taloudellinen (“economical”). Due to the number of synonyms for "effective", it is slowly becoming increasingly common to use tehokas itself for "efficient" specifically, but this is still relatively uncommon.

• (powerful): voimakas
• (effective): vaikuttava

• (antonym(s) of “powerful”): tehoton, heikko

• “tehokas”, in Kielitoimiston sanakirja [Dictionary of Contemporary Finnish]‎ (in Finnish) (online dictionary, continuously updated), Kotimaisten kielten keskuksen verkkojulkaisuja 35, Helsinki: Kotimaisten kielten tutkimuskeskus (Institute for the Languages of Finland), 2004–, retrieved 2023-07-03