challenges

NOUN

dispute, question

Synonyms

STRONGEST

objection protest test threat

STRONG

claiming confrontation dare defiance demanding demur interrogation provocation remonstrance trial ultimatum

WEAK

summons to contest

Antonyms

STRONGEST

acceptance

STRONG

peace

WEAK

agree answer decide win

VERB

dispute, question

Synonyms

STRONGEST

ask for assert call for claim confront defy demand denounce impose require test try

STRONG

accost arouse beard brave cross dare exact impeach impugn inquire investigate provoke query reclaim stimulate summon tax vindicate

WEAK

call out face down face off face the music fly in the face of hang in insist upon invite competition make a point of make a stand object to search out stand up to stick it out throw down the gauntlet

Antonyms

STRONGEST

deny

STRONG

answer calm dodge ignore

WEAK

agreement decision victory

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"Our work represents one of the best performing devices using chalcogenides, if not the best."

From Science Daily • Feb. 24, 2026

A major milestone for the team was successfully building the devices using chalcogenides, a family of specialized semiconductor glasses.

From Science Daily • Feb. 24, 2026

"These chalcogenides are excellent materials for photonics because of their high transparency and nonlinearity," Park said.

From Science Daily • Feb. 24, 2026

This is consistent with the small binding energy of electron–hole pairs in metal chalcogenides, and with the p–n junction also driving carrier extraction along with the heterostructure band offset.

From Nature • Aug. 15, 2012