balks

noun

Large, roughly squared timber beams, typically used in construction or for support.

"The old roof was supported by sturdy balks."

verb

Hesitates or is unwilling to accept an idea, undertaking, or to proceed.

"She often balks at taking risks."

Thesaurus

Synonyms: jib, baulk, resist, hindrance, handicap, deterrent, check, hinderance, impediment, rafter